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Summary of Significant Accounting Policies (Details 8) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Carrying Amount |  |
Financial assets: |  |
Cash and cash equivalents | $ 287,695 | $ 292,995
Carrying Amount | Senior secured credit facility |  |
Financial liabilities: |  |
Long-term debt | 741,944 | 748,777
Carrying Amount | Senior unsecured notes |  |
Financial liabilities: |  |
Long-term debt | 300,000 | 300,000
Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 287,695 | 292,995
Fair Value | Senior secured credit facility |  |
Financial liabilities: |  |
Long-term debt | 742,502 | 748,150
Fair Value | Senior unsecured notes |  |
Financial liabilities: |  |
Long-term debt | $ 294,000 | $ 297,000

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