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Derivatives (Effect of Interest Rate Contracts on the Statement of Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
The effect of interest rate contracts on the statement of operations:        
Loss recognized in income on interest rate contracts $ (465) $ 148 $ (461) $ 820
(Gain) loss recognized in AOCI on interest rate contracts (effective portion) $ 1,558 $ (731)    
Loss reclassified from AOCI into income (effective portion)     $ (2) $ 23