Benefit Plans and Other Postretirement Benefits (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 basispoint Y	Dec. 31, 2010	Dec. 31, 2009
U.S. plans, Pension Benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	4.45%	5.20%
Rate of compensation increase (as a percent)	3.00%	3.00%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	5.20%	5.75%	6.25%
Expected long-term return on assets (as a percent)	8.25%	8.25%	8.25%
Rate of compensation increase (as a percent)	3.00%	3.00%	3.00%
Increase or decrease in discount rate (in basis points)	0.50
Increase or decrease in accrued benefit obligation due to change in discount rate	$ 21,000
Number of years of compounded return	20
Compounded return (as a percent)	9.00%
International plans, Pension Benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	4.97%	5.26%
Rate of compensation increase (as a percent)	2.83%	2.97%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	5.26%	5.46%	6.20%
Expected long-term return on assets (as a percent)	6.30%	6.63%	6.74%
Rate of compensation increase (as a percent)	2.97%	2.96%	2.43%
U.S. plans, Other Benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	4.25%	4.85%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	4.85%	5.40%	6.25%