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Retirement Plans (Retirement Income Plan and Retirement Life Plan) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Retirement Income Plan [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2,154 $ 1,894 $ 6,462 $ 6,241
Interest cost 3,230 3,087 9,690 9,397
Expected return on plan assets (3,547) (3,482) (10,641) (10,445)
Amortization of unrecognized prior service cost 38 38 113 113
Amortization of unrecognized net loss 1,383 1,039 4,149 3,239
Net periodic cost 3,258 2,576 9,773 8,545
Retirement Life Plan [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost 73 77 221 230
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service cost 0 0 0 0
Amortization of unrecognized net loss 8 4 23 13
Net periodic cost $ 81 $ 81 $ 244 $ 243