Quarterly report pursuant to Section 13 or 15(d)

Unsecured Revolving Credit Facility (Narrative) (Details)

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Unsecured Revolving Credit Facility (Narrative) (Details) (USD $)
0 Months Ended 9 Months Ended 9 Months Ended
Jul. 15, 2013
Sep. 30, 2013
item
entity
Sep. 30, 2013
Money Market Loan [Member]
Dec. 31, 2012
Money Market Loan [Member]
Sep. 30, 2013
Maximum [Member]
Money Market Loan [Member]
Line of Credit Facility [Line Items]          
Number of lending institutions   17      
Borrowing capacity under the credit facility $ 600,000,000 $ 600,000,000 $ 75,000,000    
Expandable borrowing capacity under the credit facility   1,000,000,000      
Credit facility maturity date   Jul. 01, 2017      
Number of extension options   2      
Credit facility, extension period   6 months      
Credit facility extension fee, basis points 0.25% 0.075%      
Line of credit facility, bid feature, current borrowing capacity   300,000,000      
Terms of the unsecured facility   The terms of the unsecured facility 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 facility described below, or (ii) the property dispositions are completed while the Company is under an event of default under the facility, 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, the maximum amount of secured indebtedness, the minimum amount of fixed charge coverage, the maximum amount of unsecured indebtedness, the minimum amount of unencumbered property interest coverage and certain investment limitations.      
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.      
Outstanding borrowings under the facility     $ 0 $ 0  
Spread over LIBOR 1.25%        
Maturity period of the unsecured borrowing         30 days