Pension Plans (Schedule of Net Pension Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Retirement Benefits [Abstract]
Service costs	$ 353	$ 364
Interest costs	240	243
Amortization of actuarial loss	203	0
Settlements	0	231
Net pension period cost	$ 796	$ 838