Derivatives (Narratives) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest Rate Derivatives [Abstract]
Total notional amount of Company's variable interest rate swaps on debt	$ 205,900		$ 205,900
Notional amount of operating lease	8,600		8,600
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	$ 1,926	$ 766	3,216	$ 2,855
Loss reclassified from AOCI into income (effective portion)			5,107	$ 6,621
Reclassify net losses on interest rate contracts from AOCI to earnings over the next twelve months			$ 6,900