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Employee Benefit Plans (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Amounts Recognized in the Balance Sheet      
Current Liabilities $ 1,304,000 $ 6,331,000  
Long-Term Liabilities 38,864,000 38,708,000  
Qualified and Non-Qualified Pension Plans
      
Change in Benefit Obligation      
Benefit Obligation at Beginning of Year 49,618,000 63,872,000 75,092,000
Service Cost     2,774,000
Interest Cost 922,000 2,826,000 3,700,000
Actuarial (Gain)/ Loss 7,444,000 11,835,000 9,265,000
Plan Termination and Amendment     (12,331,000)
Benefits Paid (50,969,000) (10,831,000) (14,628,000)
Annuities Paid (7,015,000) (18,084,000)  
Benefit Obligation at End of Year   49,618,000 63,872,000
Change in Plan Assets      
Fair Value of Plan Assets at Beginning of Year 44,548,000 60,078,000 53,180,000
Actual Return on Plan Assets 2,719,000 (291,000) 7,095,000
Employer's contribution 11,251,000 14,332,000 15,416,000
Benefits Paid (50,969,000) (10,831,000) (14,628,000)
Annuities purchased (7,015,000) (18,084,000)  
Expenses Paid (534,000) (656,000) (985,000)
Fair Value of Plan Assets at End of Year   44,548,000 60,078,000
Funded Status at End of Year   (5,070,000) (3,794,000)
Amounts Recognized in the Balance Sheet      
Current Liabilities   5,070,000 603,000
Long-Term Liabilities     3,191,000
Amounts Recognized in the Balance Sheet   5,070,000 3,794,000
Amounts Recognized in Accumulated Other Comprehensive Income      
Prior Service Cost   221,000 1,267,000
Net Actuarial Loss   13,082,000 12,248,000
Amounts Recognized in Accumulated Other Comprehensive Income   13,303,000 13,515,000
Components of Net Periodic Benefit Cost      
Current Period Service Cost     2,774,000
Interest Cost 922,000 2,826,000 3,700,000
Expected Return on Plan Assets (1,747,000) (4,103,000) (4,260,000)
Amortization of Prior Service Cost 221,000 1,046,000 572,000
Amortization of Net Loss 13,082,000 10,527,000 8,705,000
Plan Termination and Amendment     423,000
Settlement 7,007,000 5,523,000 4,021,000
Net Periodic Pension cost 19,485,000 15,819,000 15,935,000
Other Changes in Qualified Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income      
Net (Gain)/Loss   16,884,000 (4,523,000)
Amortization of Prior Service Cost (221,000) (1,046,000) (572,000)
Amortization of Net Loss (13,082,000) (10,527,000) (8,705,000)
Effect of Plan Termination and Amendment     (816,000)
Settlement   (5,523,000) (4,021,000)
Total Recognized in Other Comprehensive Income (13,303,000) (212,000) (18,637,000)
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income 6,182,000 15,607,000 (2,702,000)
Postretirement Benefits Other than Pensions
      
Change in Benefit Obligation      
Benefit Obligation at Beginning of Year 39,969,000 31,947,000 34,392,000
Service Cost 1,513,000 1,403,000 1,265,000
Interest Cost 1,537,000 1,717,000 1,696,000
Actuarial (Gain)/ Loss (2,073,000) 6,015,000 (4,415,000)
Benefits Paid (778,000) (1,113,000) (991,000)
Benefit Obligation at End of Year 40,168,000 39,969,000 31,947,000
Change in Plan Assets      
Benefits Paid (778,000) (1,113,000) (991,000)
Funded Status at End of Year (40,168,000) (39,969,000) (31,947,000)
Amounts Recognized in the Balance Sheet      
Current Liabilities 1,304,000 1,261,000 1,085,000
Long-Term Liabilities 38,864,000 38,708,000 30,862,000
Amounts Recognized in the Balance Sheet 40,168,000 39,969,000 31,947,000
Estimated amounts that will be amortized from accumulated other comprehensive income into net periodic benefit      
Net actuarial loss (800,000)    
Amounts Recognized in Accumulated Other Comprehensive Income      
Prior Service Cost     632,000
Net Actuarial Loss 11,269,000 14,166,000 8,408,000
Amounts Recognized in Accumulated Other Comprehensive Income 11,269,000 14,166,000 9,040,000
Components of Net Periodic Benefit Cost      
Current Period Service Cost 1,513,000 1,403,000 1,265,000
Interest Cost 1,537,000 1,717,000 1,696,000
Amortization of Net Obligation at Transition   632,000 632,000
Amortization of Net Loss 824,000 448,000 631,000
Net Periodic Pension cost 3,874,000 4,200,000 4,224,000
Other Changes in Qualified Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income      
Net (Gain)/Loss (2,073,000) 6,015,000 (4,415,000)
Amortization of Net Obligation at Transition   (632,000) (632,000)
Amortization of Net Loss (824,000) (448,000) (631,000)
Total Recognized in Other Comprehensive Income (2,897,000) 4,935,000 (5,678,000)
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income 977,000 9,135,000 (1,454,000)
Number of retirees and their dependents to whom benefits under the plan are provided 265 275  
Weighted-average assumptions used to determine projected pension benefit obligations      
Discount Rate (as a percent) 4.00% 4.25% 5.75%
Discount Rate beginning of year (as a percent) 4.25% 5.75% 5.75%
Health Care Cost Trend Rate for Medical Benefits Assumed for Next Year (as a percent) 7.00% 8.00% 9.00%
Rate to which the cost trend rate is assumed to decline (the Ultimate Trend Rate) (as a percent) 5.00% 5.00% 5.00%
Year that the rate reaches the Ultimate Trend Rate 2015 2015 2015
Postretirement Benefits Other than Pensions | Medical, before age 65
      
Weighted-average assumptions used to determine projected pension benefit obligations      
Subsidy limit which should not exceed aggregate annual amount $ 648,000    
Annual increase in subsidy limit (as a percent) 3.50%    
Postretirement Benefits Other than Pensions | Medical, age 65 and older
      
Weighted-average assumptions used to determine projected pension benefit obligations      
Percentage of the expected annual fully-insured premium by which subsidy is limited 60.00%