Quarterly report pursuant to Section 13 or 15(d)

Unsecured Term Loan (Narrative) (Details)

v3.4.0.3
Unsecured Term Loan (Narrative) (Details)
 3 Months Ended
Mar. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]    
Unsecured term loan, net $ 347,351,000  
Loan balance 2,269,287,000 $ 2,145,393,000
Unsecured Note [Member]    
Debt Instrument [Line Items]    
Loan balance $ 1,075,000,000 1,275,000,000
Unsecured Term Loan [Member]    
Debt Instrument [Line Items]    
Loan maturity date Jan. 01, 2019  
Number of extension options | item 2  
Loan extension period 1 year  
Spread over LIBOR 1.40%  
Interest rate 3.13%  
Terms of the unsecured facility The terms of the unsecured 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 Company to continue to qualify as a REIT under the Code. The Company was in compliance with its debt covenants under its unsecured term loan as of March 31, 2016.  
Leverage ratio 60.00%  
Secured indebtedness 40.00%  
Fixed charge coverage ratio | item 1.5  
Investment limitations as a percentage of total capitalization 15.00%  
Unsecured Term Loan [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Unencumbered property interest coverage | item 2.0  
Unsecured Term Loan [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Unsecured indebtedness 60.00%  
5.800% Senior Unsecured Notes, Due January 15, 2016 [Member]    
Debt Instrument [Line Items]    
Loan maturity date Jan. 15, 2016  
Interest rate 5.80%  
5.800% Senior Unsecured Notes, Due January 15, 2016 [Member] | Unsecured Note [Member]    
Debt Instrument [Line Items]    
Loan balance $ 200,000,000 $ 200,000,000 [1]
Loan maturity date Jan. 15, 2016  
Interest rate 5.80%  
[1] On January 15, 2016, the Company repaid these notes at their maturity using proceeds from a new unsecured term loan and borrowings under the Company's unsecured revolving credit facility.