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Pension Plans and Other Postretirement Benefits (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2006
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]        
Participants are 100% vested in the Defined Contribution plan after 3 years      
Defined benefit pension plan assets fair value, total $ 32,614 $ 31,508    
Pension Plans and Other Postretirement Benefits (Additional Textual) [Abstract]        
Employer contribution as percentage of eligible compensation for hired on or after April 1, 1997 5.00%      
Period that years of service must be less than, for employees hired prior to April 1, 1997, to have defined benefit plan contribution percentage calculated at 6% of eligible compensation 15 years      
Minimum period of service, for employees hired prior to April 1, 1997, to have defined benefit plan contribution percentage calculated at 7% of eligible compensation 15 years      
Employer contribution as percentage of eligible compensation for employees hired prior to April 1, 1997 having less than 15 years of service 6.00%      
Employer contribution as percentage of eligible compensation for employees hired prior to April 1, 1997 having more than 15 years of service 7.00%      
Highest number of consecutive months of earnings used to calculate amounts earned when defined benefit and supplemental defined benefit plans were frozen 36 months      
Total expense recorded for plans 10,415 12,353 10,427  
Effective Jan. 1, 2007, minimum age at which previous group health benefits were eliminated 65 years      
Health reimbursement account balance 2,907     7,310
Health reimbursement accounts funding 168 184 315  
Reduction in expense due to changes in the plan for other postretirement benefits 431 379 350  
Amount of one time credit to HRA accounts for eligible retirees under 65 years of age 10      
Minimum funding requirement for 2013 0      
Total Fixed Maturities [Member]
        
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]        
Alignment of the assets within the plan's trust 50% fixed income funds      
Equity Securities [Member]
        
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]        
Alignment of the assets within the plan's trust 50% equity      
Level 3 [Member]
        
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]        
Defined benefit pension plan assets fair value, total 0 0    
Defined Benefit Plan [Member]
        
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]        
Employee Vesting Percentage 100.00%      
Defined benefit plan vesting percentage of participants 100.00%      
Expected amortization of net loss expected in the next fiscal year 2,367      
Supplemental Retirement Plans [Member]
        
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]        
Expected amortization of prior service cost expected in the next fiscal year 124 125 124  
Expected amortization of net loss expected in the next fiscal year 171      
401 K [Member]
        
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]        
Employee Vesting Percentage 100.00%      
401(k) Plan Employer Contribution Percent 3.00%      
Maximum percent of eligible compensation each employee may voluntarily contribute 20.00%      
Non-qualified Defined Contribution Plan [Member]
        
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]        
Participants are 100% vested in the Defined Contribution plan after 3 years      
Employee Vesting Percentage 100.00%      
Pension Costs [Member]
        
Pension Plans and Other Postretirement Benefits (Textual) [Abstract]        
Expected amortization of net loss expected in the next fiscal year $ 236