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Derivatives (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Mar. 31, 2020
Interest Rate Derivatives [Abstract]        
Total notional amount of Company's variable interest rate swaps on debt $ 235,000   $ 235,000 $ 235,000
Notional amount of operating lease 500   500  
Reclassify net losses on interest rate contracts from AOCI to earnings over the next twelve months     $ 3,800  
Amounts reclassified from AOCI to interest expense $ (961) $ 366