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Basis of Presentation and Summary of Significant Accounting Policies (Details 4) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Carrying Amount |  |
Summary of the fair value and carrying value of debt |  |
Total debt | $ 1,642,847 | $ 1,564,923
Carrying Amount | Fixed rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 1,026,847 | 814,423
Carrying Amount | Floating rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 616,000 | 750,500
Fair Value |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 1,675,000 | 1,618,000
Fair Value | Fixed rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 1,060,000 | 857,000
Fair Value | Floating rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | $ 615,000 | $ 761,000

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