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Other Amounts Recognized in Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Amortization of prior service (cost) credit $ 200    
Amortization of actuarial loss 83,600    
Pension Benefit Plans
      
Defined Benefit Plan Disclosure [Line Items]      
Net (gain) loss (53,285) 12,989 43,207
Curtailments (769) (477) (2,776)
Prior service cost (credit) 0 0 0
Amortization of prior service (cost) credit (337) (634) (1,193)
Amortization of actuarial loss (14,840) (12,085) (8,382)
Total recognized in other comprehensive (income) loss (69,231) (207) 30,856
Defined Benefit Plan Total Recognized In Net Periodic Benefit Costs And Other Comprehensive Income Before Tax (56,524) 10,482 46,492
Other Postretirement Employee Benefit Plans
      
Defined Benefit Plan Disclosure [Line Items]      
Net (gain) loss (30,323) 3,150 (5,435)
Curtailments 0 0 0
Prior service cost (credit) 5,106 (5,278) 0
Amortization of prior service (cost) credit 502 2,680 1,795
Amortization of actuarial loss 0 0 0
Total recognized in other comprehensive (income) loss (24,715) 552 (3,640)
Defined Benefit Plan Total Recognized In Net Periodic Benefit Costs And Other Comprehensive Income Before Tax $ (19,935) $ 4,380 $ 2,124