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Derivatives (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Interest Rate Derivatives [Abstract]          
Total notional amount of Company's variable interest rate swaps on debt $ 249,063   $ 249,063   $ 22,792
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax $ (633) $ 360   $ 1,283  
Loss reclassified from AOCI into income (effective portion)     (321) $ (645)  
Reclassify net losses on interest rate contracts from AOCI to earnings over the next twelve months     $ 800