Nonpension Postretirement Benefits (Net Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Nonpension Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	$ 1,472	$ 1,361	$ 1,361
Interest cost on projected benefit obligation	3,530	3,754	3,741
Amortization of unrecognized:
Prior service cost	422	422	290
Loss (gain)	915	1,090	999
Pension expense	6,339	6,627	6,391
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	1,470	1,359	1,360
Interest cost on projected benefit obligation	3,426	3,632	3,617
Amortization of unrecognized:
Prior service cost	422	422	290
Loss (gain)	916	1,107	1,028
Pension expense	6,234	6,520	6,295
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	2	2	1
Interest cost on projected benefit obligation	104	122	124
Amortization of unrecognized:
Prior service cost	0	0	0
Loss (gain)	(1)	(17)	(29)
Pension expense	$ 105	$ 107	$ 96