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Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Debt Instrument [Line Items]    
Long-term debt, gross $ 2,172,000 $ 2,222,000
Current portion of long-term debt 0 0
Long-term debt 2,172,000 2,222,000
Less unamortized debt costs (26,591) (28,268)
Long-term debt, net 2,145,409 2,193,732
2012 ABL Revolver | Revolving Credit Facility    
Debt Instrument [Line Items]    
Long-term debt, gross $ 90,000 90,000
Senior Notes | 2016 Senior Notes    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate (percent) 6.375%  
Long-term debt, gross $ 350,000 350,000
Senior Notes | 2013 Senior Notes    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate (percent) 5.375%  
Long-term debt, gross $ 400,000 400,000
Term B-4 Loans | 2012 Senior Notes    
Debt Instrument [Line Items]    
Long-term debt, gross $ 1,332,000 $ 1,382,000
Term B-4 Loans | 2012 Senior Notes | Base Rate    
Debt Instrument [Line Items]    
Debt instrument, margin step-down 2.50%  
Term B-4 Loans | 2012 Senior Notes | LIBOR    
Debt Instrument [Line Items]    
Debt instrument, basis spread on variable rate (percent) 2.75%  
Debt Instrument, variable rate, minimum 0.75%