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Pension and Other Postretirement Benefits PBO, ABO, FV of Plan Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Projected Benefit Obligation $ 238,319 $ 174,954
Accumulated Benefit Obligation 231,460 166,611
Fair Value of Plan assets 199,304 96,234
Sebree Hourly Pension Plan [Member]
   
Projected Benefit Obligation 80,369 0
Accumulated Benefit Obligation 80,369 0
Fair Value of Plan assets 82,916 0
CAWV Hourly Pension Plan [Member]
   
Projected Benefit Obligation 66,866 78,812
Accumulated Benefit Obligation 66,852 78,171
Fair Value of Plan assets 64,905 53,909
Salaried pension plan [Member]
   
Projected Benefit Obligation 66,686 69,726
Accumulated Benefit Obligation 60,870 63,344
Fair Value of Plan assets 51,483 42,325
SERB plan [Member]
   
Projected Benefit Obligation 24,398 26,416
Accumulated Benefit Obligation 23,369 25,096
Fair Value of Plan assets $ 0 $ 0