Employee Benefit Plans (Details 5)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31:
Expected long-term return on plan assets	8.00%
Pension Benefits U.S. [Member]
Weighted-average assumptions used to determine benefit obligations as of December 31:
Discount rate	4.83%	5.45%
Rate of compensation increase	4.23%	4.23%
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31:
Discount rate	5.45%	6.07%	6.27%
Expected long-term return on plan assets	8.00%	8.00%	8.25%
Rate of compensation increase	4.23%	4.23%	4.19%
Other Benefits U.S. [Member]
Weighted-average assumptions used to determine benefit obligations as of December 31:
Discount rate	4.64%	5.30%
Rate of compensation increase	0.00%	0.00%
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31:
Discount rate	5.30%	5.95%	6.42%
Expected long-term return on plan assets	0.00%	0.00%	0.00%
Rate of compensation increase	0.00%	0.00%	0.00%