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Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2011
Table Text Block Supplement [Abstract]  
Schedule of Funded Status of Defined Benefit Plan
   Defined Benefit Plan
    
Change in benefit obligation:   
    
Balance at December 31, 2010 $ 118,505
    
Service cost   162
    
Interest cost   3,090
    
Actuarial gain   (6,545)
    
Benefits paid   (1,970)
    
Currency changes   3,040
    
Benefit obligation at June 30, 2011 $ 116,282
    
Change in plan assets:   
    
Fair value of plan assets at December 31, 2010 $ 93,642
    
Actual return on plan assets   1,807
    
Employer contribution   1,535
    
Benefits paid   (1,970)
    
Currency changes   2,366
    
Fair value of plan assets at June 30, 2011 $ 97,380
    
Underfunded status at June 30, 2011 $ (18,902)