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Pension Plans and Other Postretirement Benefits (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Amortization of:      
Total recognized in other comprehensive income (loss) $ (1,276) $ 4,801 $ 2,464
Weighted-average assumptions used to determine expense:      
Discount rate 2.95% 3.68% 4.49%
Expected return on plan assets         
Weighted-average assumptions used to determine benefit obligations as of December 31:      
Discount rate 3.51% 2.95% 3.68%
Expected return on plan assets         
Defined Benefit Plan [Member]
      
Service Cost      
Benefit accrual         
Other expenses 360 250 250
Interest cost 1,427 1,658 1,877
Expected return on plan assets (2,423) (2,419) (2,388)
Settlement loss 1,209 1,290  
Amortization of:      
Actuarial loss 2,367 1,824 1,045
Net periodic pension (benefit) expense 2,940 2,603 784
Changes in plan assets and benefit obligations included in other comprehensive income (loss):      
Prior service cost         
Net actuarial loss 115 4,951 2,365
Amortization of:      
Actuarial loss (2,367) (1,824) (1,045)
Total recognized in other comprehensive income (loss) (2,252) 3,127 1,320
Weighted-average assumptions used to determine expense:      
Discount rate 3.66% 4.58% 5.27%
Expected return on plan assets 7.50% 7.50% 7.50%
Annual rate of salary increase         
Weighted-average assumptions used to determine benefit obligations as of December 31:      
Discount rate 3.51% 3.66% 4.58%
Expected return on plan assets 7.50% 7.50% 7.50%
Annual rate of salary increase         
Supplemental Defined Benefit Plans [Member]
      
Service Cost      
Benefit accrual         
Interest cost 676 799 841
Amortization of:      
Prior service cost 124 125 124
Actuarial loss 171 698 246
Net periodic pension (benefit) expense 971 1,622 1,211
Changes in plan assets and benefit obligations included in other comprehensive income (loss):      
Prior service cost         
Net actuarial loss 817 1,755 1,401
Amortization of:      
Prior service cost (124) (125) (124)
Actuarial loss (171) (698) (246)
Total recognized in other comprehensive income (loss) $ 522 $ 932 $ 1,031
Weighted-average assumptions used to determine expense:      
Discount rate 3.86% 4.92% 5.54%
Annual rate of salary increase         
Weighted-average assumptions used to determine benefit obligations as of December 31:      
Discount rate 3.51% 3.86% 4.92%
Annual rate of salary increase