Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

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Fair Value Measurements (Details) - Level 2 - Market Approach - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Financial Assets    
Certificates of deposits with maturities greater than 90 days, Carrying Value $ 2,410 $ 1,022
Certificates of deposits with maturities greater than 90 days, Fair Value 2,410 1,022
Loans Payable    
Financial Liabilities, Long-term debt    
Long-term debt, Carrying Value 220,750 225,000
Long-term debt, Fair Value 220,750 225,000
Revolving credit facility    
Financial Liabilities, Long-term debt    
Long-term debt, Carrying Value 8,497 0
Long-term debt, Fair Value $ 8,497 $ 0