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Employee Benefits (Fair Value Change in Investment in Real Estate) (Details) (Retirement Plans, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair value of plan assets at end of year $ 257,831 $ 220,568
Limited Partnership Interest in Real Estate
   
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair value of plan assets at end of prior year 8,559 [1] 8,511
Unrealized gain in fair value 298 48
Fair value of plan assets at end of year $ 8,857 [1] $ 8,559 [1]
[1] This investment is a commercial real estate partnership that purchases land, develops limited infrastructure, and sells it for commercial development. The Company is restricted from selling its partnership interest during the life of the partnership which is generally 5-7 years. Return on investment is realized as land is sold. The fair value of the limited partnership interest in real estate is based on the NAV of the partnership which reflects the appraised value of the land.