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Pension Plans and Other Postretirement Benefits (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Defined Benefit Plan [Member]
        
Service cost:        
Benefit accrual $ 0 $ 0 $ 0 $ 0
Other expenses 90 90 270 270
Interest cost 342 356 1,027 1,070
Expected return on plan assets (560) (605) (1,679) (1,817)
Settlement loss 244 161 731 1,079
Amortization of:        
Prior service cost 0 0 0 0
Actuarial (gain) loss 401 512 1,202 1,538
Net periodic pension expense (benefit) 517 514 1,551 2,140
Supplemental Defined Benefit Plans [Member]
        
Service cost:        
Benefit accrual 0 0 0 0
Other expenses 0 0 0 0
Interest cost 154 171 461 506
Expected return on plan assets 0 0 0 0
Settlement loss 0 0 0 0
Amortization of:        
Prior service cost 31 31 94 93
Actuarial (gain) loss 50 (362) 152 128
Net periodic pension expense (benefit) $ 235 $ (160) $ 707 $ 727