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Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Mar. 31, 2016
Feb. 19, 2016
Dec. 17, 2013
Feb. 21, 2013
Debt Instrument [Line Items]          
Long-term debt, gross $ 1,502,000 $ 1,652,500      
Current portion of long-term debt 0 0      
Principal amount 1,502,000 1,652,500      
Less: unamortized debt costs (22,337) (27,191)      
Long-term debt, net 1,479,663 1,625,309      
2012 ABL Revolver | Revolving Credit Facility          
Debt Instrument [Line Items]          
Long-term debt, gross $ 65,000 $ 85,000      
Senior Notes | 2016 Senior Notes          
Debt Instrument [Line Items]          
Debt instrument, stated interest rate (percent) 6.375% 6.375% 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% 5.375%   5.375%  
Long-term debt, gross $ 400,000 $ 400,000      
Senior Notes | 2012 Senior Notes          
Debt Instrument [Line Items]          
Debt instrument, stated interest rate (percent)         8.125%
Loans Payable, Term B-3 | 2012 Senior Notes          
Debt Instrument [Line Items]          
Long-term debt, gross $ 687,000 $ 817,500      
Loans Payable, Term B-3 | 2012 Senior Notes | Base Rate          
Debt Instrument [Line Items]          
Debt instrument, reference rate floor (percent) 1.75% 1.75%      
Loans Payable, Term B-3 | 2012 Senior Notes | LIBOR          
Debt Instrument [Line Items]          
Debt instrument, reference rate floor (percent) 0.75% 0.75%