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Retirement Plans (Components of Net Periodic Benefit Cost and Other Comprehensive Income (Loss) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Postretirement life curtailment benefit $ 0 $ 0 $ (4,217,000)
Net actuarial loss (gain) 16,799,000 12,045,000 (2,824,000)
Reversal of amortization of net actuarial loss (4,172,000) (4,134,000) (5,274,000)
Reversal of amortization of prior service (cost) credit (150,000) (150,000) 508,000
Defined benefit pension plans, Gross (12,477,000) (7,761,000) 6,203,000
Retirement Income Plan [Member]
      
Service cost 7,575,000 7,626,000 7,078,000
Interest cost 12,349,000 11,914,000 10,944,000
Expected return on plan assets (13,924,000) (11,247,000) (9,214,000)
Amortization of unrecognized prior service cost 150,000 150,000 150,000
Amortization of unrecognized net loss 4,154,000 4,128,000 4,660,000
Postretirement life curtailment benefit 0 0 0
Net periodic cost 10,304,000 12,571,000 13,618,000
Net actuarial loss (gain) 16,575,000 11,844,000 (3,470,000)
Reversal of amortization of net actuarial loss (4,154,000) (4,128,000) (4,660,000)
Reversal of amortization of prior service (cost) credit (150,000) (150,000) (150,000)
Defined benefit pension plans, Gross 12,271,000 7,566,000 (8,280,000)
Total recognized in net periodic benefit cost and other comprehensive loss (income) 22,575,000 20,137,000 5,338,000
Estimated net actuarial loss that will be amortized from AOCI into net periodic benefit cost 5,500,000    
Estimated prior service cost that will be amortized from AOCI into net periodic benefit cost 200,000    
Retirement Life Plan [Member]
      
Service cost 0 0 32,000
Interest cost 306,000 316,000 361,000
Expected return on plan assets 0 0 0
Amortization of unrecognized prior service cost 0 0 (44,000)
Amortization of unrecognized net loss 18,000 6,000 0
Postretirement life curtailment benefit 0 0 (4,217,000)
Net periodic cost 324,000 322,000 (3,868,000)
Net actuarial loss (gain) 224,000 201,000 646,000
Reversal of amortization of net actuarial loss (18,000) (6,000) (614,000)
Reversal of amortization of prior service (cost) credit 0 0 2,045,000
Defined benefit pension plans, Gross 206,000 195,000 2,077,000
Total recognized in net periodic benefit cost and other comprehensive loss (income) $ 530,000 $ 517,000 $ (1,791,000)