Derivatives (Narratives) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Interest Rate Derivatives [Abstract]
Total notional amount of Company's variable interest rate swaps on debt	$ 202,000		$ 202,000
Notional amount of operating lease	8,200		8,200
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	$ 1,922	$ 2,699	5,138	$ 5,554
Loss reclassified from AOCI into income (effective portion)			6,940	$ 9,736
Reclassify net losses on interest rate contracts from AOCI to earnings over the next twelve months			$ 5,800