Debt (Details 2) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2013
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Dec. 31, 2012
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Carrying amount and estimated fair value of debt | ||||||
Carrying Value | $ 2,093,106 | $ 2,019,168 | ||||
4.25% Exchangeable Senior Notes
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Carrying amount and estimated fair value of debt | ||||||
Carrying Value | 558 | [1] | 230,934 | [1] | ||
Carrying Amount
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Carrying amount and estimated fair value of debt | ||||||
Variable-rate debt | 856,087 | 838,032 | ||||
Carrying Value | 2,093,106 | 2,019,168 | ||||
Carrying Amount | 3.60% Senior Notes
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Carrying amount and estimated fair value of debt | ||||||
Fixed-rate debt | 347,121 | 0 | ||||
Carrying Amount | 4.25% Exchangeable Senior Notes
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Carrying amount and estimated fair value of debt | ||||||
Fixed-rate debt | 558 | 230,934 | ||||
Carrying Amount | Other fixed-rate debt
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Carrying amount and estimated fair value of debt | ||||||
Fixed-rate debt | 889,340 | 950,202 | ||||
Total Estimated Fair Value
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Carrying amount and estimated fair value of debt | ||||||
Variable-rate debt | 859,839 | 845,558 | ||||
Carrying Value | 2,058,083 | 2,054,020 | ||||
Total Estimated Fair Value | 3.60% Senior Notes
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Carrying amount and estimated fair value of debt | ||||||
Fixed-rate debt | 320,691 | 0 | ||||
Total Estimated Fair Value | 4.25% Exchangeable Senior Notes
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Carrying amount and estimated fair value of debt | ||||||
Fixed-rate debt | 578 | 240,282 | ||||
Total Estimated Fair Value | Other fixed-rate debt
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Carrying amount and estimated fair value of debt | ||||||
Fixed-rate debt | $ 876,975 | $ 968,180 | ||||
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