Nonpension Postretirement Benefits (Change in Accumulated Benefit Obligation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Nonpension Postretirement Benefit Plans
Change in projected benefit obligation:
Benefit obligation, beginning of year	$ 73,217	$ 72,754
Service Cost	1,472	1,361	1,361
Interest cost	3,530	3,754	3,741
Plan participants' contributions	1,307	1,419
ERRP to be used to reduce retiree contribution	76	25
Plan amendments	(2,672)	0
Actuarial (gain) loss	3,654	(1,406)
Exchange rate fluctuations	61	(53)
Benefits paid	(4,438)	(4,637)
Benefit obligation, end of year	76,207	73,217	72,754
Funded status and accrued benefit cost	(76,207)	(73,217)
U.S. Plans
Change in projected benefit obligation:
Benefit obligation, beginning of year	70,541	70,181
Service Cost	1,470	1,359	1,360
Interest cost	3,426	3,632	3,617
Plan participants' contributions	1,307	1,419
ERRP to be used to reduce retiree contribution	76	25
Plan amendments	(2,672)	0
Actuarial (gain) loss	3,682	(1,555)
Exchange rate fluctuations	0	0
Benefits paid	(4,307)	(4,520)
Benefit obligation, end of year	73,523	70,541	70,181
Funded status and accrued benefit cost	(73,523)	(70,541)
Non-U.S. Plans
Change in projected benefit obligation:
Benefit obligation, beginning of year	2,676	2,573
Service Cost	2	2	1
Interest cost	104	122	124
Plan participants' contributions	0	0
ERRP to be used to reduce retiree contribution	0	0
Plan amendments	0	0
Actuarial (gain) loss	(28)	149
Exchange rate fluctuations	61	(53)
Benefits paid	(131)	(117)
Benefit obligation, end of year	2,684	2,676	2,573
Funded status and accrued benefit cost	$ (2,684)	$ (2,676)