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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