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Derivatives (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Interest Rate Derivatives [Abstract]    
Total notional amount of Company's variable interest rate swaps on debt $ 107,400  
Notional amount of operating lease 5,800  
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax 422 $ 960
Loss reclassified from AOCI into income (effective portion) 500 $ 1,550
Reclassify net losses on interest rate contracts from AOCI to earnings over the next twelve months $ 18