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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