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Pension Liabilities (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
employee
Dec. 31, 2011
Pension Liabilities, Net [Abstract]    
Number of participants 139  
Number of retired plan participants 133  
Benefit obligation, discount rate 4.20% 3.80%
Net periodic benefit cost, discount rate 4.20%  
Actuarial gain $ 158 $ 325