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Basis of Presentation and Summary of Significant Accounting Policies (Details 4) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Carrying Amount |  |
Summary of the fair value and carrying value of debt |  |
Total debt | $ 2,089,762 | $ 2,026,902
Carrying Amount | Fixed rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 1,041,762 | 1,041,402
Carrying Amount | Floating rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 1,048,000 | 985,500
Fair Value |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 2,092,000 | 1,946,000
Fair Value | Fixed rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 1,043,000 | 960,000
Fair Value | Floating rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | $ 1,049,000 | $ 986,000

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