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Income tax expense (benefit) statutory rate versus actual rate (Details 5) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Computed tax at federal statutory rate      
Computed tax at federal statutory rate $ 145,466,000 $ (15,914,000) $ 117,679,000
Federal statutory rate (in hundredths) 35.00% 35.00% 35.00%
Increases (reductions) resulting from:      
State income taxes, net of federal income tax 10,524,000 2,469,000 10,653,000
State income tax rate (in hundredths) 2.50% (5.40%) 3.20%
Nonqualified benefit plans (5,173,000) (2,359,000) (2,918,000)
Nonqualified benefit plans (in hundredths) (1.20%) 5.20% (0.90%)
Depletion allowance (3,764,000) (3,728,000) (3,266,000)
Depletion allowance rate (in hundredths) (0.90%) 8.20% (1.00%)
Federal renewable energy credit (3,404,000) (3,401,000) (3,485,000)
Federal renewable energy credit rate (in hundreths) (0.80%) 7.50% (1.00%)
Deductible K-Plan dividends (1,593,000) (2,829,000) (2,282,000)
Deductible K-Plan dividends rate (in hundredths) (0.40%) 6.20% (0.70%)
AFUDC equity (1,074,000) (1,500,000) (873,000)
AFUDC equity rate (in hundredths) (0.30%) 3.30% (0.30%)
Resolution of tax matters and uncertain tax positions (859,000) 2,559,000 (3,906,000)
Resolution of tax matters and uncertain tax positions rate (in hundredths) (0.20%) (5.60%) (1.20%)
Deferred tax rate changes 741,000 (3,083,000) (417,000)
Deferred tax rate changes rate (in hundredths) 0.20% 6.80% (0.10%)
Other (4,128,000) (3,360,000) (911,000)
Other rate (in hundredths) (1.00%) 7.30% (0.20%)
Total income tax expense (benefit) 136,736,000 (31,146,000) 110,274,000
Total income tax expense (benefit) rate (in hundredths) 32.90% 68.50% 32.80%
Temporary differences [Abstract]      
Undistributed earnings from foreign operations 7,000,000    
Deferred tax liabilities, undistributed foreign earnings $ 2,200,000