Derivatives (Narratives) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest Rate Derivatives [Abstract]
Total notional amount of Company's variable interest rate swaps on debt	$ 298,300		$ 298,300
Notional amount of operating lease	10,100		10,100
Reclassify net losses on interest rate contracts from AOCI to earnings over the next twelve months			11,700
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	$ 766	$ 2,785	2,855	$ 3,619
Loss reclassified from AOCI into income (effective portion)			$ 6,621	$ 7,298