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Secured Debt (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2012 | Dec. 31, 2011
Secured Debt (Textual) [Abstract] |  |  |
Secured debt amount which encumbers real estate owned based upon book value | $ 2,300,000,000 | $ 2,300,000,000 |
Percentage of secured debt which encumbers real estate owned based upon book value | 29.80% | 29.80% |
Secured debt amount of real estate owned which is unencumbered | 5,400,000,000 | 5,400,000,000 |
Percentage of secured debt of real estate owned which is unencumbered | 70.20% | 70.20% |
Number of secured credit facilities | 3 |  |
Credit facilities with aggregate commitment | 932,800,000 | 932,800,000 |
Secured debt including debt on real estate held for sale | 1,442,361,000 | 1,442,361,000 | 1,891,553,000
Initial term of credit facilities (in years) | 10 years |  |
Weighted average interest rate |  | 4.35% |
Unamortized fair market adjustment | 19,500,000 | 19,500,000 | 24,100,000
Fixed Rate Debt [Member] |  |  |
Secured Debt (Textual) [Abstract] |  |  |
Secured debt including debt on real estate held for sale | 1,098,837,000 | 1,098,837,000 | 1,334,717,000
Weighted average interest rate |  | 5.20% |
Variable Rate Debt [Member] |  |  |
Secured Debt (Textual) [Abstract] |  |  |
Secured debt including debt on real estate held for sale | 343,524,000 | 343,524,000 | 556,836,000
Weighted average interest rate |  | 1.63% |
Mortgage notes payable [Member] | Fixed Rate Debt [Member] |  |  |
Secured Debt (Textual) [Abstract] |  |  |
Secured debt including debt on real estate held for sale | 466,266,000 | 466,266,000 | 590,208,000
Weighted average interest rate |  | 5.31% |
Debt Instrument, Maturity Date Range, Start | 10/31/2012 |  |
Debt instrument, maturity date range, end | 5/31/2019 |  |
Notes payable minimum interest rates range | 3.43% |  |
Notes payable maximum interest rates range | 6.54% |  |
Mortgage notes payable [Member] | Variable Rate Debt [Member] |  |  |
Secured Debt (Textual) [Abstract] |  |  |
Secured debt including debt on real estate held for sale | 37,415,000 | 37,415,000 | 151,685,000
Weighted average interest rate |  | 1.06% |
Debt instrument, maturity date range, end | July 2013 |  |
Notes payable minimum interest rates range | 1.06% |  |
Tax Exempt Notes Payable [Member] | Variable Rate Debt [Member] |  |  |
Secured Debt (Textual) [Abstract] |  |  |
Secured debt including debt on real estate held for sale | 94,700,000 | 94,700,000 | 94,700,000
Weighted average interest rate |  | 0.85% |
Tax Exempt Secured Notes Payable [Member] | Variable Rate Debt [Member] |  |  |
Secured Debt (Textual) [Abstract] |  |  |
Debt Instrument, Maturity Date Range, Start | 8/31/2019 |  |
Debt instrument, maturity date range, end | 3/31/2030 |  |
Notes payable minimum interest rates range | 0.71% |  |
Notes payable maximum interest rates range | 0.90% |  |
Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member] |  |  |
Secured Debt (Textual) [Abstract] |  |  |
Secured debt including debt on real estate held for sale | 632,571,000 | 632,571,000 | 744,509,000
Weighted average interest rate |  | 5.12% |
Fannie Mae credit facilities [Member] | Variable Rate Debt [Member] |  |  |
Secured Debt (Textual) [Abstract] |  |  |
Secured debt including debt on real estate held for sale | $ 211,409,000 | $ 211,409,000 | $ 310,451,000
Weighted average interest rate |  | 2.08% |

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