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Retirement Plans (Funded Status of Retirement Income Plan and Retirement Life Plan) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Weighted-Average Liability Asumptions      
Discount rate 4.42%    
Retirement Income Plan [Member]
      
Change In Benefit Obligation [Abstract]      
Benefit obligation, beginning of year $ 254,009,000 $ 230,642,000  
Service cost 8,091,000 7,575,000 7,626,000
Interest cost 12,981,000 12,349,000 11,914,000
Actuarial losses 33,596,000 9,177,000  
Benefits paid (6,030,000) (5,734,000)  
Benefit obligation, end of year 302,647,000 254,009,000 230,642,000
Change In Fair Value Of Assets Abstract      
Fair value of assets, beginning of year 182,614,000 173,311,000  
Actual return on plan assets, net of expenses 21,896,000 6,526,000  
Contributions by the employer to funded plans 8,550,000 8,400,000  
Contributions by the employer to unfunded plans 120,000 111,000  
Benefits paid fair value (6,030,000) (5,734,000)  
Fair value of assets, end of year 207,150,000 182,614,000 173,311,000
Funded status (95,497,000) (71,395,000)  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Liabilities (95,497,000) (71,395,000)  
Net pension liability, end of year (95,497,000) (71,395,000)  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]      
Prior service cost 26,000 176,000  
Net actuarial loss 103,365,000 83,321,000  
Total 103,391,000 83,497,000  
Accumulated benefit obligation 265,899,000 223,655,000  
Weighted-Average Liability Asumptions      
Discount rate 4.42% 5.16%  
Rate of compensation increase 4.00% 4.00%  
Retirement Life Plan [Member]
      
Change In Benefit Obligation [Abstract]      
Benefit obligation, beginning of year 5,897,000 5,700,000  
Service cost 0 0 0
Interest cost 302,000 306,000 316,000
Actuarial losses 660,000 224,000  
Benefits paid (388,000) (333,000)  
Benefit obligation, end of year 6,471,000 5,897,000 5,700,000
Change In Fair Value Of Assets Abstract      
Fair value of assets, beginning of year 0 0  
Actual return on plan assets, net of expenses 0 0  
Contributions by the employer to funded plans 0 0  
Contributions by the employer to unfunded plans 0 0  
Benefits paid fair value 0 0  
Fair value of assets, end of year 0 0 0
Funded status (6,471,000) (5,897,000)  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Liabilities (6,471,000) (5,897,000)  
Net pension liability, end of year (6,471,000) (5,897,000)  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]      
Prior service cost 0 0  
Net actuarial loss 1,667,000 1,047,000  
Total 1,667,000 1,047,000  
Accumulated benefit obligation $ 0 $ 0  
Weighted-Average Liability Asumptions      
Discount rate 4.42% 5.16%  
Rate of compensation increase 0.00% 0.00%