Benefit Plans and Other Postretirement Benefits (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
U.S. plans, Pension Benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	3.75%	4.45%
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)	4.45%	5.20%	5.75%
Expected long-term return on assets (as a percent)	8.00%	8.25%	8.25%
Rate of compensation increase (as a percent)	3.00%	3.00%	3.00%
Increase or decrease in discount rate (in percent)	0.0050
Increase or decrease in accrued benefit obligation due to change in discount rate	$ 23,000
Number of years of compounded return	20 years
Compounded return (as a percent)	9.00%
International plans, Pension Benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	3.97%	4.97%
Rate of compensation increase (as a percent)	2.57%	2.83%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	4.97%	5.26%	5.46%
Expected long-term return on assets (as a percent)	5.66%	6.30%	6.63%
Rate of compensation increase (as a percent)	2.83%	2.97%	2.96%
U.S. plans, Other Benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	3.45%	4.25%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	4.25%	4.85%	5.40%