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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, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Defined Benefit Plan [Member]
        
Service Cost        
Benefit accrual          
Other expenses 90 63 270 188
Interest cost 356 424 1,070 1,268
Expected return on plan assets (605) (610) (1,817) (1,820)
Settlement loss 161 1,098 1,079 1,098
Amortization of:        
Prior service cost          
Actuarial loss 512 478 1,538 1,366
Net periodic pension (benefit) expense 514 1,453 2,140 2,100
Supplemental Defined Benefit Plans [Member]
        
Service Cost        
Benefit accrual          
Other expenses          
Interest cost 171 201 506 598
Expected return on plan assets          
Settlement loss          
Amortization of:        
Prior service cost 31 31 93 94
Actuarial loss (362) 194 128 523
Net periodic pension (benefit) expense $ (160) $ 426 $ 727 $ 1,215