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Debt (Details 3) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
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| Carrying amount and estimated fair value of debt | ||||||
| Debt, net | $ 1,927,703 | $ 2,019,168 | ||||
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Senior Notes
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| Carrying amount and estimated fair value of debt | ||||||
| Debt, net | 592,700 | |||||
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4.25% Exchangeable Senior Notes
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| Carrying amount and estimated fair value of debt | ||||||
| Debt, net | 563 | [1] | 230,934 | [1] | ||
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Carrying Amount
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| Carrying amount and estimated fair value of debt | ||||||
| Variable-rate debt | 657,691 | 838,032 | ||||
| Debt, net | 1,927,703 | 2,019,168 | ||||
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Carrying Amount | Senior Notes
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| Carrying amount and estimated fair value of debt | ||||||
| Fixed-rate debt | 592,689 | 0 | ||||
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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 | 563 | 230,934 | ||||
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Carrying Amount | Fixed-rate debt excluding other fixed rate debt not separately disclosed
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| Carrying amount and estimated fair value of debt | ||||||
| Fixed-rate debt | 676,760 | 950,202 | ||||
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Total Estimated Fair Value
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| Carrying amount and estimated fair value of debt | ||||||
| Variable-rate debt | 657,527 | 845,558 | ||||
| Debt, net | 1,884,473 | 2,054,020 | ||||
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Total Estimated Fair Value | Senior Notes
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| Carrying amount and estimated fair value of debt | ||||||
| Fixed-rate debt | 575,374 | 0 | ||||
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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 | 575 | 240,282 | ||||
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Total Estimated Fair Value | Fixed-rate debt excluding other fixed rate debt not separately disclosed
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| Carrying amount and estimated fair value of debt | ||||||
| Fixed-rate debt | $ 650,997 | $ 968,180 | ||||
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