Employee Benefit Plans (Components of net periodic benefit costs post retirement benefits) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Postemployment Benefits [Abstract]
Service cost for benefits earned during the period	$ 240	$ 207	$ 720	$ 620
Interest cost on accumulated postretirement benefit	188	180	564	540
Other components	9	3	27	10
Net periodic postretirement benefit cost	$ 437	$ 390	$ 1,311	$ 1,170