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Retirement Plans (Plan's Allocated Target and Ranges and Actual Weighted Average Asset Allocation by Investment Categories) (Details)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Actual percentage 100.00% 100.00%
Maximum percentage of equity security value of total plans portfolio value that is allowed 8.00%  
Maximum percentage of any corporation outstanding shares that is allowed for retirement income plan equity portfolio 5.00%  
International Securities [Member]
    
Target percentage 10.00%  
Actual percentage 8.00% 7.00%
Range minimum   4.00%
Range maximum   18.00%
Large Capitalization Securities [Member]
    
Target percentage 15.00%  
Actual percentage 13.00% 15.00%
Range minimum   8.00%
Range maximum   32.00%
Small And Mid Capitalization Securities [Member]
    
Target percentage 5.00%  
Actual percentage 5.00% 7.00%
Range minimum   3.00%
Range maximum   15.00%
Global Asset Allocation [Member]
    
Target percentage 10.00%  
Actual percentage 12.00% 10.00%
Range minimum   0.00%
Range maximum   15.00%
Partnership Interest [Member]
    
Target percentage 10.00%  
Actual percentage 5.00% 6.00%
Range minimum   0.00%
Range maximum   15.00%
Extended Duration Fixed Maturity [Member]
    
Target percentage 50.00%  
Actual percentage 42.00% 24.00%
Range minimum   20.00%
Range maximum   80.00%
Domestic Core Debt Securities [Member]
    
Actual percentage 0.00% [1] 14.00% [1]
Global bond high yield emerging markets [Member]
    
Actual percentage 12.00% [1] 13.00% [1]
Cash and short term investments [Member]
    
Target percentage 0.00%  
Actual percentage 3.00% 4.00%
Range minimum   0.00%
Range maximum   5.00%
[1] The Retirement Income Plan currently has fixed maturity security exposures that do not have target and range percentages since these exposures will be phased out over time as we opportunistically migrate from intermediate to long duration fixed maturity security strategies.