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Fair Value Measurements (Summary of Carrying Amounts and Estimated Fair Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Senior Notes | 2016 Senior Notes | Carrying value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans payable, fair value disclosure $ 600,000 $ 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 610,500 367,500
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 402,000 409,000
Term Loans | 2012 Term B-5 Loans | Carrying value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans payable, fair value disclosure 938,000 1,382,000
Term Loans | 2012 Term B-5 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 939,173 1,395,820
Revolving Credit Facility | 2012 ABL Revolver | Carrying value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Line of credit, fair value disclosure 75,000 90,000
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 $ 75,000 $ 90,000