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Debt (Details 3) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2012
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Dec. 31, 2011
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| Carrying amount and estimated fair value of debt | ||||||
| Debt, net | $ 2,019,168 | $ 2,426,303 | ||||
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Fixed rate mortgage loans
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| Carrying amount and estimated fair value of debt | ||||||
| Debt, net | 948,414 | [1] | 1,052,421 | [1] | ||
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Secured Debt [Member]
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| Carrying amount and estimated fair value of debt | ||||||
| Debt, net | 1,016,446 | 1,131,970 | ||||
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Other construction loan facilities
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| Carrying amount and estimated fair value of debt | ||||||
| Debt, net | 29,557 | 40,336 | ||||
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Variable rate secured loans
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| Carrying amount and estimated fair value of debt | ||||||
| Debt, net | 38,475 | 39,213 | ||||
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4.25% Exchangeable Senior Notes
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| Carrying amount and estimated fair value of debt | ||||||
| Debt, net | 227,283 | |||||
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Senior exchangeable notes
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| Carrying amount and estimated fair value of debt | ||||||
| Debt, net | 230,934 | |||||
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Revolving Credit Facility
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| Carrying amount and estimated fair value of debt | ||||||
| Debt, net | 0 | 662,000 | ||||
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Term Loan Facility
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| Carrying amount and estimated fair value of debt | ||||||
| Debt, net | 770,000 | 400,000 | ||||
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Unsecured notes payable
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| Carrying amount and estimated fair value of debt | ||||||
| Debt, net | 1,788 | 5,050 | ||||
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Carrying Amount
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| Carrying amount and estimated fair value of debt | ||||||
| Variable-rate debt | 838,032 | 1,141,549 | ||||
| Debt, net | 2,019,168 | 2,426,303 | ||||
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Carrying Amount | 4.25% Exchangeable Senior Notes
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| Carrying amount and estimated fair value of debt | ||||||
| Fixed-rate debt | 230,934 | 227,283 | ||||
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Carrying Amount | Other fixed-rate debt
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| Carrying amount and estimated fair value of debt | ||||||
| Fixed-rate debt | 950,202 | 1,057,471 | ||||
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Total Estimated Fair Value
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| Carrying amount and estimated fair value of debt | ||||||
| Variable-rate debt | 845,558 | 1,139,856 | ||||
| Debt, net | 2,054,020 | 2,432,357 | ||||
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Total Estimated Fair Value | 4.25% Exchangeable Senior Notes
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| Carrying amount and estimated fair value of debt | ||||||
| Fixed-rate debt | 240,282 | 238,077 | ||||
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Total Estimated Fair Value | Other fixed-rate debt
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| Carrying amount and estimated fair value of debt | ||||||
| Fixed-rate debt | $ 968,180 | $ 1,054,424 | ||||
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