Derivatives (Narratives) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest Rate Derivatives [Abstract]
Total notional amount of Company's variable interest rate swaps on debt	$ 123,200		$ 123,200
Notional amount of operating lease	7,000		7,000
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	$ 740	$ 1,926	1,700	$ 3,216
Loss reclassified from AOCI into income (effective portion)			2,618	$ 5,107
Reclassify net losses on interest rate contracts from AOCI to earnings over the next twelve months			$ 2,400