Pensions and Other Postretirement Benefit Plans (Schedule of Net Periodic Benefit Plan Cost) (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]
Service cost	$ 3,117	$ 3,572	$ 3,574
Interest cost	19,958	19,644	18,448
Other adjustments
Expected return on assets	(15,858)	(15,127)	(20,754)
Amortization of prior service cost/(credit)	37	16	102
Amortization of transition obligation	83	94	88
Amortization of net actuarial loss	5,672	4,738	2,085
Settlement	327	839	368
Curtailment (gain)/loss		34	(541)
Special / contractual termination benefits	233
Net periodic benefit cost	13,569	13,810	3,370
Initial rate
Ultimate rate
Years to ultimate
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	931	910	1,126
Interest cost	3,869	4,054	3,820
Other adjustments	945
Expected return on assets
Amortization of prior service cost/(credit)	(3,666)	(3,666)	(4,327)
Amortization of transition obligation
Amortization of net actuarial loss	3,022	2,923	2,780
Settlement
Curtailment (gain)/loss		1,921	(6,452)
Special / contractual termination benefits
Net periodic benefit cost	$ 5,101	$ 2,300	$ (3,053)
Initial rate
Ultimate rate
Years to ultimate
United States Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.59%	5.80%	6.25%
Expected return on plan assets	5.80%	6.10%	8.50%
Rate of compensation increase
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.29%	5.84%	5.81%
Expected return on plan assets	6.80%	6.91%	6.91%
Rate of compensation increase	3.47%	3.42%	3.24%
United States Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.55%	5.70%	6.10%
Expected return on plan assets
Rate of compensation increase	3.00%	3.00%	3.00%
Non-U.S. Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate
Expected return on plan assets
Rate of compensation increase