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Background and Significant Accounting Policies (Details 6) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Carrying Amount |  |
Summary of the fair value and carrying value of debt |  |
Total debt | $ 1,564,923 | $ 1,773,039
Carrying Amount | Fixed rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 814,423 | 794,039
Carrying Amount | Floating rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 750,500 | 979,000
Fair Value |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 1,618,000 | 1,781,000
Fair Value | Fixed rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 857,000 | 792,000
Fair Value | Floating rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | $ 761,000 | $ 989,000

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