Debt (Details 2) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2014
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Dec. 31, 2013
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Carrying amount and estimated fair value of debt | ||||||
Carrying Value | $ 1,931,831 | $ 1,927,703 | ||||
4.25% Exchangeable Senior Notes
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Carrying amount and estimated fair value of debt | ||||||
Carrying Value | 565 | [1] | 563 | [1] | ||
Carrying Amount
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Carrying amount and estimated fair value of debt | ||||||
Variable-rate debt | 657,491 | 657,691 | ||||
Carrying Value | 1,931,831 | 1,927,703 | ||||
Carrying Amount | Unsecured senior notes
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Carrying amount and estimated fair value of debt | ||||||
Fixed-rate debt | 592,838 | 592,689 | ||||
Carrying Amount | 4.25% Exchangeable Senior Notes
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Carrying amount and estimated fair value of debt | ||||||
Fixed-rate debt | 565 | 563 | ||||
Carrying Amount | Other fixed-rate debt
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Carrying amount and estimated fair value of debt | ||||||
Fixed-rate debt | 680,937 | 676,760 | ||||
Total Estimated Fair Value
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Carrying amount and estimated fair value of debt | ||||||
Variable-rate debt | 657,420 | 657,527 | ||||
Carrying Value | 1,911,122 | 1,884,473 | ||||
Total Estimated Fair Value | Unsecured senior notes
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Carrying amount and estimated fair value of debt | ||||||
Fixed-rate debt | 584,178 | 575,374 | ||||
Total Estimated Fair Value | 4.25% Exchangeable Senior Notes
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Carrying amount and estimated fair value of debt | ||||||
Fixed-rate debt | 575 | 575 | ||||
Total Estimated Fair Value | Other fixed-rate debt
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Carrying amount and estimated fair value of debt | ||||||
Fixed-rate debt | $ 668,949 | $ 650,997 | ||||
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