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Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Net Benefit Costs [Table Text Block] The following are the components of defined benefit pension expense for the years ended December 31 (in thousands):
    2012     2011     2010  
Service cost   $ 1,775     $ 1,890     $ 1,875  
Interest cost     980       1,010       840  
Expected return on plan assets     (115 )     (125 )     —  
Recognition of actuarial gain     (215 )     (135 )     (350 )
Recognition of termination benefits     175       65       65  
Total defined benefit pension expense (1)   $ 2,600     $ 2,705     $ 2,430  
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] The following are the assumptions used in the computation of pension expense for the years ended Dec
    2012     2011     2010  
Weighted-average discount rate (1)     3.20 %     4.40 %     3.95 %
Average compensation increase     2.70 %     2.65 %     2.80 %
Schedule of Changes in Projected Benefit Obligations [Table Text Block] The following table provides information related to changes in the projected benefit obligation for the years ended December 31 (in thousands):
    2012     2011     2010  
Projected benefit obligation at beginning of year   $ 21,160     $ 19,730     $ 14,358  
Service cost     1,775       1,890       1,875  
Interest cost     980       1,010       840  
Actuarial loss (gain) due to assumption changes (1)     6,265       (948 )     1,100  
Additions     1,925       —       1,961  
Benefits paid (2)     (680 )     (390 )     (220 )
Foreign currency impact     180       (132 )     (184 )
Projected benefit obligation at end of year (3)   $ 31,605     $ 21,160     $ 19,730  
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] The following table provides information regarding the funded status of the plans and related amounts recorded in the Company’s Consolidated Balance Sheets as of December 31 (in thousands):
    2012     2011     2010  
Projected benefit obligation   $ 31,605     $ 21,160     $ 19,730  
Plan assets at fair value (1)     (8,885 )     (2,480 )     (2,130 )
Funded status – shortfall (2)   $ 22,720     $ 18,680     $ 17,600  
                         
Amounts recorded in the Consolidated Balance Sheets for the plans:
             
Other liabilities — accrued pension obligation (2)   $ 22,720     $ 18,680     $ 17,600  
Stockholders’ equity — deferred actuarial (loss) gain (3)   $ (1,578 )   $ 2,488     $ 2,205