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Management Actions (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Severence and Related Costs - 2012 Action
   
Reconciliation of restructuring liability    
Balance, beginning of period $ 373  
Restructuring action   760
Cash payments (297) (414)
Foreign currency adjustments (5) 27
Balance, end of period 71 373
Severance and Related Costs - 2013 Action
   
Reconciliation of restructuring liability    
Restructuring action 1,440  
Cash payments (534)  
Balance, end of period $ 906