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Fair Value of Financial Instruments - (Carrying Amounts and Estimated Fair Values) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 31, 2019
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative asset $ 739 $ 0
Notes 300,000 300,000
Derivative liability 0 1,151
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative asset 739 0
Notes 306,000 297,000
Derivative liability $ 0 $ 1,151