Derivatives (Narratives) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Interest Rate Derivatives [Abstract]
Total notional amount of Company's variable interest rate swaps on debt	$ 120,300		$ 120,300
Notional amount of operating lease	6,600		6,600
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	$ 565	$ 1,922	2,265	$ 5,138
Loss reclassified from AOCI into income (effective portion)			3,308	$ 6,940
Reclassify net losses on interest rate contracts from AOCI to earnings over the next twelve months			$ 1,500