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Fair Value Measurements (Summary of Carrying Amounts and Estimated Fair Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 31, 2016
Senior Notes | 2016 Senior Notes | Carrying value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans payable, fair value disclosure $ 350,000 $ 350,000
Senior Notes | 2016 Senior Notes | Fair value | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans payable, fair value disclosure 367,500 363,125
Senior Notes | 2013 Senior Notes | Carrying value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans payable, fair value disclosure 400,000 400,000
Senior Notes | 2013 Senior Notes | Fair value | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans payable, fair value disclosure 409,000 408,000
Term Loans | Term B-4 Loans | Carrying value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans payable, fair value disclosure 1,382,000 817,500
Term Loans | Term B-4 Loans | Fair value | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans payable, fair value disclosure 1,395,820 818,522
Revolving Credit Facility | 2012 ABL Revolver | Carrying value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Line of credit, fair value disclosure 90,000 85,000
Revolving Credit Facility | 2012 ABL Revolver | Fair value | Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Line of credit, fair value disclosure $ 90,000 $ 85,000