Nonpension Postretirement Benefits (Net Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Nonpension Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	$ 1,008	$ 1,192	$ 1,472
Interest cost on projected benefit obligation	2,948	2,732	3,530
Amortization of unrecognized:
Prior service cost	140	140	422
Loss (gain)	267	857	915
Pension expense	4,363	4,921	6,339
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	1,007	1,190	1,470
Interest cost on projected benefit obligation	2,840	2,622	3,426
Amortization of unrecognized:
Prior service cost	140	140	422
Loss (gain)	267	857	916
Pension expense	4,254	4,809	6,234
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	1	2	2
Interest cost on projected benefit obligation	108	110	104
Amortization of unrecognized:
Prior service cost	0	0	0
Loss (gain)	0	0	(1)
Pension expense	$ 109	$ 112	$ 105