Quarterly report pursuant to Section 13 or 15(d)

Basis of Financial Statement Presentation - Fair Value Measurements (Details)

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Basis of Financial Statement Presentation - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money markets, Carrying Value $ 33,694 $ 60,687
Total debt, Carrying Value (311,778) (294,471)
Certificates of Deposit, at carrying value 16,700 32,200
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt, Fair Value (321,492) (303,170)
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  
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 3,193  
Derivative Asset, Fair Value, Gross Asset   5,141
Derivative Liability (3,376) 0
Total debt, Fair Value (321,492) (303,170)
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  
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 33,694 60,687
Money markets | Level 1 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money markets, Fair Value Measurement 33,694 60,687
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