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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