Pension Plans (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2016	Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Defined benefit pension plan, liabilities	$ 53,500		$ 53,500	$ 53,500
Defined benefit pension plan liabilities, current	600		600	600
Defined benefit pension plan, liabilities, noncurrent	52,900		52,900	52,900
Actuarial losses due to decline in discount rates	2,300			12,800
Actuarial gain due to settlements		$ 700
Expected periodic pension cost in current fiscal year				2,900
Benefits paid	$ 100		$ 216	200
Defined benefit plan expected contributions in current fiscal year				$ 500