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Retirement Plans (Components of Net Periodic Benefit Cost and Other Comprehensive Income) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net actuarial loss $ 26,566,000 $ 16,799,000 $ 12,045,000
Reversal of amortization of net actuarial loss (5,903,000) (4,172,000) (4,134,000)
Reversal of amortization of prior service cost (150,000) (150,000) (150,000)
Total recognized in other comprehensive income 20,513,000 12,477,000 7,761,000
Retirement Income Plan [Member]
      
Service cost 8,091,000 7,575,000 7,626,000
Interest cost 12,981,000 12,349,000 11,914,000
Expected return on plan assets (14,206,000) (13,924,000) (11,247,000)
Amortization of unrecognized prior service cost 150,000 150,000 150,000
Amortization of unrecognized actuarial loss 5,863,000 4,154,000 4,128,000
Net periodic cost 12,879,000 10,304,000 12,571,000
Net actuarial loss 25,906,000 16,575,000 11,844,000
Reversal of amortization of net actuarial loss (5,863,000) (4,154,000) (4,128,000)
Reversal of amortization of prior service cost (150,000) (150,000) (150,000)
Total recognized in other comprehensive income 19,893,000 12,271,000 7,566,000
Total recognized in net periodic benefit cost and other comprehensive income 32,772,000 22,575,000 20,137,000
Estimated net actuarial loss that will be amortized from AOCI into net periodic benefit cost 7,300,000    
Retirement Life Plan [Member]
      
Service cost 0 0 0
Interest cost 302,000 306,000 316,000
Expected return on plan assets 0 0 0
Amortization of unrecognized prior service cost 0 0 0
Amortization of unrecognized actuarial loss 40,000 18,000 6,000
Net periodic cost 342,000 324,000 322,000
Net actuarial loss 660,000 224,000 201,000
Reversal of amortization of net actuarial loss (40,000) (18,000) (6,000)
Reversal of amortization of prior service cost 0 0 0
Total recognized in other comprehensive income 620,000 206,000 195,000
Total recognized in net periodic benefit cost and other comprehensive income 962,000 530,000 517,000
Estimated net actuarial loss that will be amortized from AOCI into net periodic benefit cost $ 100,000