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Pension Plan Pension plan net periodic benefit costs (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Qualified Pension Plan [Member]
     
Defined Benefit Plan Disclosure      
Service cost for benefits earned during the year $ 14,075 $ 12,082 $ 11,527
Interest cost on projected benefit obligation 26,312 28,326 29,104
Expected return on plan assets (37,878) (36,423) (30,089)
Amortization of prior service cost (credit) 98 98 98
Recognized net loss 7,844 4,183 5,003
Additional amount recognized due to curtailment/settlement 0 0 221
Net pension benefit cost 10,451 8,266 15,864
Change in prior service cost 0 0 (221)
Change in net gain or loss 20,365 52,820 (33,482)
Amortization of prior service cost (credit) (98) (98) (98)
Amortization of net gain (loss) (7,844) (4,183) (5,003)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period, Net of Tax 12,423 48,539 (38,804)
Total recognized in net periodic benefit cost and other comprehensive loss 22,874 56,805 (22,940)
Supplemental Employee Retirement Plans [Member]
     
Defined Benefit Plan Disclosure      
Service cost for benefits earned during the year 380 361 371
Interest cost on projected benefit obligation 408 515 789
Expected return on plan assets 0 0 0
Amortization of prior service cost (credit) 0 0 (192)
Recognized net loss 169 153 501
Additional amount recognized due to curtailment/settlement 198 560 737
Net pension benefit cost 1,155 1,589 2,206
Change in prior service cost 0 0 0
Change in net gain or loss 815 (608) (886)
Amortization of prior service cost (credit) 0 0 192
Amortization of net gain (loss) (169) (153) (501)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period, Net of Tax 646 (761) (1,195)
Total recognized in net periodic benefit cost and other comprehensive loss $ 1,801 $ 828 $ 1,011