Quarterly report pursuant to Section 13 or 15(d)

Unsecured Revolving Credit Facility And Term Loans (Narrative) (Details)

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Unsecured Revolving Credit Facility And Term Loans (Narrative) (Details)
 6 Months Ended
Jan. 25, 2017
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entity
Jan. 24, 2017
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entity
Jun. 30, 2018
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item
Dec. 31, 2017
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Mar. 29, 2017
Mar. 22, 2017
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Jan. 26, 2017
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Jan. 31, 2016
USD ($)
Line of Credit Facility [Line Items]                
Loan balance     $ 2,646,437,000 $ 2,809,568,000        
Outstanding borrowings under the facility     $ 856,188,000 822,288,000        
Unsecured Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Number of lending institutions | entity   17            
Borrowing capacity under the credit facility   $ 600,000,000            
Credit facility maturity date     Jul. 01, 2017          
Outstanding borrowings under the facility     $ 183,000,000 150,000,000        
2017 Credit Agreement [Member]                
Line of Credit Facility [Line Items]                
Terms of the unsecured facility     The 2017 Credit Agreement, which applies to both the 2017 Credit Facility and 2017 Term Loan, includes certain restrictions and covenants which limit, among other things the incurrence of additional indebtedness, the incurrence of liens and the disposition of real estate properties (to the extent that: (i) such property dispositions cause the Company to default on any of the financial ratios of the 2017 Credit Agreement (described below), or (ii) the property dispositions are completed while the Company is under an event of default under the 2017 Credit Agreement, unless, under certain circumstances, such disposition is being carried out to cure such default), and which require compliance with financial ratios relating to the maximum leverage ratio (60 percent), the maximum amount of secured indebtedness (40 percent), the minimum amount of fixed charge coverage (1.5 times), the maximum amount of unsecured indebtedness (60 percent), the minimum amount of unencumbered property interest coverage (2.0 times) and certain investment limitations (generally 15 percent of total capitalization).          
Terms of dividend restriction     If an event of default has occurred and is continuing, the entire outstanding balance under the 2017 Credit Agreement may (or, in the case of any bankruptcy event of default, shall) become immediately due and payable, and the Company will not make any excess distributions except to enable the General Partner to continue to qualify as a REIT under the IRS Code.          
2017 Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Loan maturity date     Jan. 01, 2021          
Number of lending institutions | entity 13              
Borrowing capacity under the credit facility $ 600,000,000              
Number of extension options | item     2          
Credit facility, extension period     6 months          
Terms of the unsecured facility     The terms of the 2017 Credit Facility include: (1) a four-year term ending in January 2021, with two six-month extension options; (2) revolving credit loans may be made to the Company in an aggregate principal amount of up to $600 million (subject to increase as discussed below), with a sublimit under the 2017 Credit Facility for the issuance of letters of credit in an amount not to exceed $60 million (subject to increase as discussed below); (3) an interest rate based on the Operating Partnership's unsecured debt ratings from Moody's or S&P, currently the London Inter-Bank Offered Rate ("LIBOR") plus 120 basis points, or, at the Operating Partnership's option, if it no longer maintains a debt rating from Moody's or S&P or such debt ratings fall below Baa3 and BBB-, based on a defined leverage ratio; and (4) a facility fee payable quarterly based on the Operating Partnership's unsecured debt ratings from Moody's or S&P, currently 25 basis points, or, at the Operating Partnership's option, if it no longer maintains a debt rating from Moody's or S&P or such debt ratings fall below Baa3 and BBB-, based on a defined leverage ratio.          
Spread over LIBOR     1.20%          
Loan period     4 years          
Facility fee basis points     0.25%          
2017 Credit Agreement, Letter Of Credit [Member]                
Line of Credit Facility [Line Items]                
Borrowing capacity under the credit facility 60,000,000              
Maximum loan increase that may be requested             $ 100,000,000  
Unsecured Term Loan [Member] | Unsecured Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Outstanding borrowings under the facility     $ 856,200,000 822,300,000        
5.800% Senior Unsecured Notes, Due January 15, 2016 [Member]                
Line of Credit Facility [Line Items]                
Loan balance               $ 200,000,000
Loan maturity date     Jan. 15, 2016          
2017 Term Loan [Member]                
Line of Credit Facility [Line Items]                
Loan balance           $ 325,000,000    
Loan maturity date     Jan. 01, 2020          
Unamortized deferred financing costs     $ 1,300,000 1,700,000        
Loan extension period     1 year          
Interest rate swap         1.6473%      
Interest rate         3.1973%      
Borrowing capacity under the credit facility $ 325,000,000              
Number of extension options | item     2          
Terms of the unsecured facility     The terms of the 2017 Term Loan include: (1) a three-year term ending in January 2020, with two one-year extension options; (2) multiple draws of the term loan commitments may be made within 12 months of the effective date of the 2017 Credit Agreement up to an aggregate principal amount of $325 million (subject to increase as discussed below), with no requirement to be drawn in full; provided, that, if the Company does not borrow at least 50 percent of the initial term commitment from the term lenders (i.e. 50 percent of $325 million) on or before July 25, 2017, the amount of unused term loan commitments shall be reduced on such date so that, after giving effect to such reduction, the amount of unused term loan commitments is not greater than the outstanding term loans on such date; (3) an interest rate based on the Operating Partnership's unsecured debt ratings from Moody's or S&P, currently the LIBOR plus 140 basis points, or, at the Operating Partnership's option if it no longer maintains a debt rating from Moody's or S&P or such debt ratings fall below Baa3 and BBB-, based on a defined leverage ratio; and (4) a term commitment fee on any unused term loan commitment during the first 12 months after the effective date of the 2017 Credit Agreement at a rate of 0.25 percent per annum on the sum of the average daily unused portion of the aggregate term loan commitments.          
Outstanding borrowings under the facility     $ 323,700,000 323,300,000        
Spread over LIBOR     1.40%          
Loan period     3 years          
Minimum percentage of initial borrowing     50.00%          
Term commitment fee percent     0.25%          
Incremental Commitments [Member]                
Line of Credit Facility [Line Items]                
Maximum loan increase that may be requested             $ 350,000,000  
2016 Term Loan [Member]                
Line of Credit Facility [Line Items]                
Unsecured term loan, net               $ 350,000,000
Loan maturity date     Jan. 01, 2019          
Unamortized deferred financing costs     $ 500,000 1,000,000        
Interest rate     3.28%          
Number of extension options | item     2          
Credit facility, extension period     1 year          
Terms of the unsecured facility     The terms of the 2016 Term Loan include certain restrictions and covenants which limit, among other things the incurrence of additional indebtedness, the incurrence of liens and the disposition of real estate properties (to the extent that: (i) such property dispositions cause the Company to default on any of the financial ratios of the term loan described below, or (ii) the property dispositions are completed while the Company is under an event of default under the term loan, unless, under certain circumstances, such disposition is being carried out to cure such default), and which require compliance with financial ratios relating to the maximum leverage ratio (60 percent), the maximum amount of secured indebtedness (40 percent), the minimum amount of fixed charge coverage (1.5 times), the maximum amount of unsecured indebtedness (60 percent), the minimum amount of unencumbered property interest coverage (2.0 times) and certain investment limitations (generally 15 percent of total capitalization).          
Terms of dividend restriction     If an event of default has occurred and is continuing, the Company will not make any excess distributions except to enable the General Partner to continue to qualify as a REIT under the IRS Code. The Company was in compliance with its debt covenants under its unsecured revolving credit facility and term loans as of June 30, 2018.          
Outstanding borrowings under the facility     $ 349,500,000 $ 349,000,000        
Spread over LIBOR     1.40%