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Total Comprehensive Income (Tables)
9 Months Ended
Sep. 30, 2011
Table Text Block Supplement [Abstract] 
Schedule of Comprehensive Income
Total Comprehensive Income (Loss)           
  Three Months Ended  Nine Months Ended
  September 30,   September 30,
  2011  2010  2011  2010
Net income$ 10,707 $ 22,069 $ 49,694 $ 55,299
            
Translation adjustment  (6,852)   7,361   (621)   (3,552)
            
Unrealized gain/(loss) on defined benefit plan, net of tax  (3,783)   1,802   1,347   (4,068)
            
Comprehensive income  72   31,232   50,420   47,679
            
Less: Comprehensive income attributable to noncontrolling interest  (750)   (907)   (2,072)   (2,532)
            
Total comprehensive income (loss) attributable to common stockholders$ (678) $ 30,325 $ 48,348 $ 45,147