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Long-Term Debt (Principal Outstanding) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Principal outstanding $ 660,372  
2023 Senior Notes [Member]    
Debt Instrument [Line Items]    
Annual interest rate (as a percentage) 6.625%  
Principal outstanding $ 473,767 $ 473,767
2016 Notes [Member]    
Debt Instrument [Line Items]    
Annual interest rate (as a percentage) 10.25%  
Principal outstanding $ 158,544 253,989
2019 Notes [Member]    
Debt Instrument [Line Items]    
Annual interest rate (as a percentage) 7.50%  
Principal outstanding $ 0 $ 0