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Notes Payable, Credit Facility and Repurchase Agreements (Details) (USD $)
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6 Months Ended | 6 Months Ended | 6 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2012
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Dec. 31, 2011
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Jun. 30, 2012
Fixed rate debt
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Jun. 30, 2012
Fixed rate debt
Minimum
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Jun. 30, 2012
Fixed rate debt
Maximum
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Jun. 30, 2012
Variable rate debt
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Jun. 30, 2012
Variable rate debt
LIBOR
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Jun. 30, 2012
Credit facility
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Jun. 30, 2012
Credit facility
Term loan
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Jun. 30, 2012
Credit facility
Term loan
LIBOR
Minimum
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Jun. 30, 2012
Credit facility
Term loan
LIBOR
Maximum
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Jun. 30, 2012
Credit facility
Revolving credit facility
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Jun. 30, 2012
Credit facility
Letter of credit
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Feb. 24, 2011
Credit facility
Fixed rate debt, variable rate debt fixed through the use of interest rate swaps
Term loan
LIBOR
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Jun. 30, 2012
Credit facility
Company leverage ratio
Term loan
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Jun. 30, 2012
Repurchase agreements
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| Debt Instrument [Line Items] | ||||||||||||||||
| Notes payable and line of credit | $ 1,747,505,000 | $ 1,767,591,000 | $ 1,400,000,000 | $ 4,300,000 | $ 316,100,000 | |||||||||||
| Gross real estate and related assets securing debt | 2,500,000,000 | 635,400,000 | ||||||||||||||
| Debt, weighted average interest rate | 5.85% | 5.56% | 3.93% | |||||||||||||
| Debt instrument, weighted average years to maturity | 3 years 9 months 25 days | |||||||||||||||
| Fixed rate debt, interest rate | 3.52% | 7.22% | ||||||||||||||
| Basis spread | 2.75% | 2.75% | 4.00% | 3.50% | ||||||||||||
| Debt repayments | 44,000,000 | 65,000,000 | ||||||||||||||
| Debt borrowings | 10,700,000 | |||||||||||||||
| Senior unsecured credit facility [Abstract] | ||||||||||||||||
| Senior unsecured credit facility, current borrowing capacity | 350,000,000 | 111,100,000 | 238,900,000 | 476,000 | ||||||||||||
| Senior unsecured credit facility, additional borrowings | 77,000,000 | |||||||||||||||
| Senior unsecured credit facility, repayments | 54,000,000 | |||||||||||||||
| Senior unsecured credit facility, outstanding | $ 111,100,000 | $ 205,000,000 | ||||||||||||||
| Fixed interest rate through derivatives | 1.44% | |||||||||||||||