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Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Carrying Amount |  |
Financial assets: |  |
Cash and cash equivalents | $ 292,995 | $ 260,467
Investment in corporate debt securities |  | 6,790
Carrying Amount | Senior secured credit facility |  |
Financial liabilities: |  |
Long-term debt | 748,777 | 2,393,459
Carrying Amount | Senior unsecured notes |  |
Financial liabilities: |  |
Long-term debt | 300,000 |
Carrying Amount | Senior subordinated notes |  |
Financial liabilities: |  |
Long-term debt |  | 325,000
Carrying Amount | Other long-term obligations |  |
Financial liabilities: |  |
Long-term debt |  | 10,000
Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 292,995 | 260,467
Investment in corporate debt securities |  | 6,790
Fair Value | Senior secured credit facility |  |
Financial liabilities: |  |
Long-term debt | 748,150 | 2,401,225
Fair Value | Senior unsecured notes |  |
Financial liabilities: |  |
Long-term debt | 297,000 |
Fair Value | Senior subordinated notes |  |
Financial liabilities: |  |
Long-term debt |  | 368,875
Fair Value | Other long-term obligations |  |
Financial liabilities: |  |
Long-term debt |  | $ 10,000

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