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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Components of pension (income) expense    
Service cost $ 25 $ 36
Interest cost on projected benefit obligation 1,870 2,068
Net amortizations and deferrals 842 585
Expected return on plan assets (2,430) (2,554)
Total $ 307 $ 135