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Derivatives (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Interest Rate Derivatives [Abstract]        
Total notional amount of Company's variable interest rate swaps on debt $ 24,400   $ 24,400  
Notional amount of operating lease 5,400   5,400  
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax $ 216 $ 740 638 $ 1,700
Loss reclassified from AOCI into income (effective portion)     645 $ 2,618
Reclassify net losses on interest rate contracts from AOCI to earnings over the next twelve months     $ 200