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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, 2012
Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair value of plan assets at end of year $ 220,568 $ 191,369
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 8,511 [1] 7,757
Sale of land   (102)
Unrealized gain in fair value 48 856
Fair value of plan assets at end of year $ 8,559 [1] $ 8,511 [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 of investment is realized as land is sold. The fair value of the limited partnership interest in real estate is based on the net asset value of the partnership which reflects the appraised value of the land.