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Debt (Details 2) (USD $) In Thousands | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Carrying amount and estimated fair value of debt |  |
Debt, net | $ 2,299,416 | $ 2,323,681
Carrying Amount |  |
Carrying amount and estimated fair value of debt |  |
Fixed-rate debt | 1,455,739 | 1,559,034
Variable- rate debt | 843,677 | 764,647
Debt, net | 2,299,416 | 2,323,681
Total Estimated Fair Value |  |
Carrying amount and estimated fair value of debt |  |
Fixed-rate debt | 1,464,754 | 1,579,022
Variable- rate debt | 849,935 | 769,247
Debt, net | $ 2,314,689 | $ 2,348,269

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