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Retirement Plans (Funded Status of Retirement Income Plan and Retirement Life Plan) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Retirement Income Plan [Member]
      
Change In Benefit Obligation [Abstract]      
Benefit obligation, beginning of year $ 230,642 $ 200,041  
Service cost 7,575 7,626 7,078
Interest cost 12,349 11,914 10,944
Defined Benefit Plan, Actuarial Net (Gains) Losses 9,177 16,339  
Defined Benefit Plan, Benefits Paid (5,734) (5,278)  
Benefit obligation, end of year 254,009 230,642 200,041
Change In Fair Value Of Assets Abstract      
Fair value of plan assets, beginning of year 173,311 139,749  
Actual return on plan assets, net of expenses 6,526 15,743  
Contributions by the employer to funded plans 8,400 23,000  
Contributions by the employer to unfunded plans 111 97  
Fair value of plan assets, end of year 182,614 173,311 139,749
Funded status (71,395) (57,331)  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Liabilities (71,395) (57,331)  
Net pension liability, end of year (71,395) (57,331)  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]      
Prior service cost 176 326  
Net actuarial loss 83,321 70,901  
Total 83,497 71,227  
Accumulated benefit obligation 223,655 199,028  
Weighted-Average Liability Asumptions      
Discount rate 5.16% 5.55%  
Rate of compensation increase 4.00% 4.00%  
Retirement Life Plan [Member]
      
Change In Benefit Obligation [Abstract]      
Benefit obligation, beginning of year 5,700 5,503  
Service cost 0 0 32
Interest cost 306 316 361
Defined Benefit Plan, Actuarial Net (Gains) Losses 224 201  
Defined Benefit Plan, Benefits Paid (333) (320)  
Benefit obligation, end of year 5,897 5,700 5,503
Change In Fair Value Of Assets Abstract      
Funded status (5,897) (5,700)  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Liabilities (5,897) (5,700)  
Net pension liability, end of year (5,897) (5,700)  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]      
Prior service cost 0 0  
Net actuarial loss 1,047 841  
Total 1,047 841  
Accumulated benefit obligation $ 0 $ 0  
Weighted-Average Liability Asumptions      
Discount rate 5.16% 5.55%  
Rate of compensation increase 0.00% 0.00%