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Pension Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Components of net periodic pension cost    
Service cost $ 37 $ 299
Interest cost 311 344
Expected return on plan assets (367) (298)
Recognized net actuarial loss 124 176
Net periodic pension cost $ 106 $ 521