Pensions and Other Postretirement Benefit Plans (Schedule of Plan Benefit Obligations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation, beginning of year	$ 374,115	$ 353,971
Service cost	3,117	3,572	3,574
Interest cost	19,958	19,644	18,448
Plan participants' contributions	387	378
Actuarial loss/(gain)	39,712	26,013
Curtailments		(1,619)
Benefits paid	(26,562)	(23,956)
Settlements	(891)	(5,722)
Special / Contractual Termination Benefits	233
Plan amendments		346
Other
Removal of defined contribution component		(1,710)
Foreign currency changes	(4,153)	3,038
Benefit obligation, end of year	405,880	374,115	353,971
Accumulated benefit obligation	391,457	356,691
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation, beginning of year	72,137	73,208
Service cost	931	910	1,126
Interest cost	3,869	4,054	3,820
Plan participants' contributions	1,319	607
Actuarial loss/(gain)	6,977	2,539
Curtailments		(1,921)
Benefits paid	(7,142)	(7,260)
Settlements
Special / Contractual Termination Benefits
Plan amendments
Other	945
Removal of defined contribution component
Foreign currency changes	(27)
Benefit obligation, end of year	79,009	72,137	73,208
Accumulated benefit obligation
United States Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.82%	5.59%
Compensation increase
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.48%	5.27%
Compensation increase	3.19%	3.47%
United States Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.85%	5.55%
Compensation increase	3.00%	3.00%
Non-U.S. Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate
Compensation increase	3.00%	3.00%