Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Basis of Financial Statement Presentation - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money markets, Carrying Value $ 62,846 $ 60,687
Total debt, Carrying Value (312,096) (294,471)
Certificates of Deposit, at carrying value 34,100 32,200
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt, Fair Value (322,700) (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 706  
Derivative Asset, Fair Value, Gross Asset   5,141
Derivative Liability (3,145) 0
Total debt, Fair Value (322,700) (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 62,846 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 62,846 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