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
Dec. 31, 2017
Mar. 31, 2017
Financial Assets    
Certificates of deposits with maturities greater than 90 days, Carrying Value $ 1,031 $ 44,786
Certificates of deposits with maturities greater than 90 days, Fair Value 1,031 44,786
Loans Payable    
Financial Liabilities, Long-term debt    
Long-term debt, Carrying Value 250,000 81,000
Long-term debt, Fair Value $ 250,000 $ 81,000