Derivatives (Narratives) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Interest Rate Derivatives [Abstract]
Total notional amount of Company's variable interest rate swaps on debt	$ 194,400
Notional amount of operating lease	7,400
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	960	$ 1,290
Loss reclassified from AOCI into income (effective portion)	1,550	$ 2,809
Reclassify net losses on interest rate contracts from AOCI to earnings over the next twelve months	$ 3,400