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Employee Benefit Plans (Details 2)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
United States plan [Member]
      
Assumption rates used for net periodic benefit costs      
Discount rate: 4.95% 5.26% 6.23%
Expected return on assets:   7.50% 7.75%
Expected return on assets, minimum: 5.50%    
Expected return on assets, maximum: 6.50%    
International plans [Member]
      
Assumption rates used for net periodic benefit costs      
Discount rate minimum: 5.25% 5.25% 5.75%
Discount rate maximum: 5.65% 5.75% 6.50%
Salary increase minimum: 2.00% 2.50% 2.50%
Salary increase maximum: 4.33% 4.25% 4.50%
Expected return on assets, minimum: 4.50% 6.00% 6.00%
Expected return on assets, maximum: 7.06% 6.85% 6.85%