Nonpension Postretirement Benefits (Net Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Nonpension Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	$ 856	$ 1,008	$ 1,192
Interest cost on projected benefit obligation	2,589	2,948	2,732
Amortization of unrecognized:
Prior service cost	140	140	140
Loss (gain)	536	267	857
Pension expense	4,121	4,363	4,921
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	855	1,007	1,190
Interest cost on projected benefit obligation	2,537	2,840	2,622
Amortization of unrecognized:
Prior service cost	140	140	140
Loss (gain)	592	267	857
Pension expense	4,124	4,254	4,809
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	1	1	2
Interest cost on projected benefit obligation	52	108	110
Amortization of unrecognized:
Prior service cost	0	0	0
Loss (gain)	(56)	0	0
Pension expense	$ (3)	$ 109	$ 112