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Fair Value of Derivatives and Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |
Contingent consideration accrued in business combination |  | $ 3,000 |
Unsecured debt instruments |  |  |
Redeemable non-controlling interests | 243,305 | 236,475 | [1]
Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Notes Receivable, Fair Value Disclosure | 45,419 |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |
Total assets | 45,436 | 89 |
Contingent consideration accrued in business combination | 3,000 | 3,000 | [2]
Unsecured debt instruments |  |  |
Total liabilities | 3,568,367 | 4,104,800 |
Redeemable non-controlling interests | 243,305 | 236,475 | [1]
Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |
Derivatives - Interest rate contracts | 17 | 89 | [3]
Derivatives - Interest rate contracts | 13,404 | 13,660 | [3]
Mortgage notes payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Secured debt instruments - fixed rate |  |  |
Secured debt instruments - fixed rate | 509,387 | 635,531 | [4]
Secured debt instruments - variable rate |  |  |
Secured debt instruments - variable rate | 37,415 | 151,685 | [4]
Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Secured debt instruments - variable rate |  |  |
Secured debt instruments - variable rate | 94,700 | 94,700 | [4]
Credit Facilities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Secured debt instruments - fixed rate |  |  |
Secured debt instruments - fixed rate | 690,817 | 799,584 | [4]
Secured debt instruments - variable rate |  |  |
Secured debt instruments - variable rate | 211,409 | 310,451 | [4]
Commercial bank [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Unsecured debt instruments |  |  |
Unsecured debt instruments | 0 | 421,000 | [5]
Unsecured Debt [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Unsecured debt instruments |  |  |
Unsecured debt instruments | 2,008,235 | 1,675,189 | [5]
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Notes Receivable, Fair Value Disclosure | 0 |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |
Total assets | 0 | 0 |
Contingent consideration accrued in business combination | 0 | 0 | [2]
Unsecured debt instruments |  |  |
Total liabilities | 0 | 0 |
Redeemable non-controlling interests | 0 | 0 | [1]
Level 1 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |
Derivatives - Interest rate contracts | 0 | 0 | [3]
Derivatives - Interest rate contracts | 0 | 0 | [3]
Level 1 [Member] | Mortgage notes payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Secured debt instruments - fixed rate |  |  |
Secured debt instruments - fixed rate | 0 | 0 | [4]
Secured debt instruments - variable rate |  |  |
Secured debt instruments - variable rate | 0 | 0 | [4]
Level 1 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Secured debt instruments - variable rate |  |  |
Secured debt instruments - variable rate | 0 | 0 | [4]
Level 1 [Member] | Credit Facilities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Secured debt instruments - fixed rate |  |  |
Secured debt instruments - fixed rate | 0 | 0 | [4]
Secured debt instruments - variable rate |  |  |
Secured debt instruments - variable rate | 0 | 0 | [4]
Level 1 [Member] | Commercial bank [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Unsecured debt instruments |  |  |
Unsecured debt instruments | 0 | 0 | [5]
Level 1 [Member] | Unsecured Debt [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Unsecured debt instruments |  |  |
Unsecured debt instruments | 0 | 0 | [5]
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Notes Receivable, Fair Value Disclosure | 0 |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |
Total assets | 17 | 89 |
Contingent consideration accrued in business combination | 0 | 0 | [2]
Unsecured debt instruments |  |  |
Total liabilities | 13,404 | 13,660 |
Level 2 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |
Derivatives - Interest rate contracts | 17 | 89 | [3]
Derivatives - Interest rate contracts | 13,404 | 13,660 | [3]
Level 2 [Member] | Mortgage notes payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Secured debt instruments - fixed rate |  |  |
Secured debt instruments - fixed rate | 0 | 0 | [4]
Secured debt instruments - variable rate |  |  |
Secured debt instruments - variable rate | 0 | 0 | [4]
Level 2 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Secured debt instruments - variable rate |  |  |
Secured debt instruments - variable rate | 0 | 0 | [4]
Level 2 [Member] | Credit Facilities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Secured debt instruments - fixed rate |  |  |
Secured debt instruments - fixed rate | 0 | 0 | [4]
Secured debt instruments - variable rate |  |  |
Secured debt instruments - variable rate | 0 | 0 | [4]
Level 2 [Member] | Commercial bank [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Unsecured debt instruments |  |  |
Unsecured debt instruments | 0 | 0 | [5]
Level 2 [Member] | Unsecured Debt [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Unsecured debt instruments |  |  |
Unsecured debt instruments | 0 | 0 | [5]
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Notes Receivable, Fair Value Disclosure | 45,419 |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |
Total assets | 45,419 | 0 |
Contingent consideration accrued in business combination | 3,000 | 3,000 | [2]
Unsecured debt instruments |  |  |
Total liabilities | 3,554,963 | 4,091,140 |
Redeemable non-controlling interests | 0 | 0 | [1]
Level 3 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis |  |  |
Derivatives - Interest rate contracts | 0 | 0 | [3]
Derivatives - Interest rate contracts | 0 | 0 | [3]
Level 3 [Member] | Mortgage notes payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Secured debt instruments - fixed rate |  |  |
Secured debt instruments - fixed rate | 509,387 | 635,531 | [4]
Secured debt instruments - variable rate |  |  |
Secured debt instruments - variable rate | 37,415 | 151,685 | [4]
Level 3 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Secured debt instruments - variable rate |  |  |
Secured debt instruments - variable rate | 94,700 | 94,700 | [4]
Level 3 [Member] | Credit Facilities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Secured debt instruments - fixed rate |  |  |
Secured debt instruments - fixed rate | 690,817 | 799,584 | [4]
Secured debt instruments - variable rate |  |  |
Secured debt instruments - variable rate | 211,409 | 310,451 | [4]
Level 3 [Member] | Commercial bank [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Unsecured debt instruments |  |  |
Unsecured debt instruments | 0 | 421,000 | [5]
Level 3 [Member] | Unsecured Debt [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Unsecured debt instruments |  |  |
Unsecured debt instruments | $ 2,008,235 | $ 1,675,189 | [5]
[1] | See Note 9, "Noncontrolling Interests"
[2] | The fair value of the contingent purchase consideration is related to our acquisition of a development property in a consolidated joint venture in 2011. (See Note 5, “Joint Ventures.”)
[3] | See Note 11, “Derivatives and Hedging Activity”
[4] | See Note 6, “Secured Debt”
[5] | See Note 7, “Unsecured Debt”

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