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Pension and Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Pension plan [Member]
        
Pension plan:        
Service cost $ 15 $ 10 $ 45 $ 30
Interest cost 82 92 246 276
Expected return on plan assets (94) (97) (282) (291)
Amortization of net actuarial loss 83 63 249 189
Net periodic benefit cost 86 68 258 204
Health care plan [Member]
        
Pension plan:        
Interest cost 1    3   
Amortization of gain (2) (1) (6) (3)
Net periodic benefit cost $ (1) $ (1) $ (3) $ (3)