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Management Actions (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Severance, Early Retirement and Related Costs - 2010 Action
     
Reconciliation of restructuring liability      
Balance, beginning of period $ 106 $ 1,584  
Restructuring action     1,671
Cash payments (102) (1,534) (87)
Foreign currency adjustments (4) (54)  
Change in estimate   110  
Balance, end of period 0 106 1,584
Severence and Related Costs - 2012 Action
     
Reconciliation of restructuring liability      
Restructuring action 760    
Cash payments (414)    
Foreign currency adjustments 27    
Balance, end of period $ 373