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Basis of Financial Statement Presentation - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money markets, Carrying Value $ 63,701 $ 83,891
Total debt, Carrying Value (305,676) (324,623)
Certificates of Deposit, at carrying value 35,400 33,900
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt, Fair Value (315,905) (343,125)
Level 1 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Instruments in Hedges, Assets, at Fair Value 0 0
Derivative Liability 0 0
Total debt, Fair Value 0 0
Level 2 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Instruments in Hedges, Assets, at Fair Value 4,951  
Derivative Liability (4,273) 0
Total debt, Fair Value (315,905) (343,125)
Level 3 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Instruments in Hedges, Assets, at Fair Value 0 0
Derivative Liability 0 0
Total debt, Fair Value 0 0
Money markets | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money markets, Fair Value Measurement 63,701 83,891
Money markets | Level 1 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money markets, Fair Value Measurement 63,701 83,891
Money markets | Level 2 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money markets, Fair Value Measurement 0 0
Money markets | Level 3 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money markets, Fair Value Measurement $ 0 $ 0