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Long-Term Debt (Narrative Redemptions and Restrictions) (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 19, 2016
Mar. 31, 2018
Mar. 31, 2017
Debt Instrument [Line Items]      
Unamortized debt costs   $ 20,048 $ 28,268
Revolving Credit Facility | 2012 ABL Revolver      
Debt Instrument [Line Items]      
Unamortized debt costs   1,100 1,300
Repayments of long-term debt   75,000  
Revolving credit facility, remaining borrowing capacity   $ 96,600  
Senior Notes | 2013 Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage of principal amount (as percent)   101.00%  
Unamortized debt costs   $ 5,000 4,600
Senior Notes | 2016 Senior Notes      
Debt Instrument [Line Items]      
Unamortized debt costs   $ 3,700 4,900
Senior Notes | Indirect guarantee of indebtedness | 2016 Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage of principal amount (as percent) 101.00%    
Senior Notes | Prior to December 15, 2016 | 2013 Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, percentage of principal amount which can be redeemed (as percent)   35.00%  
Debt instrument, redemption price, percentage of principal amount, using proceeds of equity offerings (as percent)   105.375%  
Senior Notes | Prior to March 1, 2019 | 2016 Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, percentage of principal amount which can be redeemed (as percent) 40.00%    
Debt instrument, redemption price, percentage of principal amount (as percent) 100.00%    
Term Loans | 2012 Term Loan      
Debt Instrument [Line Items]      
Unamortized debt costs   $ 11,300 $ 18,800