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Retirement Plans (Changes in Fair Value of Securities Using Significant Unobservable Inputs) (Details) (Retirement Income Plan [Member], USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Fair value of assets, beginning of year $ 207,150,000 $ 182,614,000
Total gains (realized and unrealized) included in changes in net assets 15,925,000 21,896,000
Fair value of assets, end of year 225,817,000 207,150,000
Significant Unobservable Inputs (Level 3) [Member] | Alternative Investments [Member]
    
Fair value of assets, beginning of year 12,631,000 15,180,000
Total gains (realized and unrealized) included in changes in net assets 2,131,000 1,118,000
Purchases 560,000 434,000
Sales 0 0
Issuances 0 0
Settlements (3,163,000) (4,142,000)
Transfers into level 3 0 41,000
Transfers out of level 3 0 0
Fair value of assets, end of year $ 12,159,000 $ 12,631,000