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Income Taxes (Details 5) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Undistributed earnings from foreign operations $ 6,900,000    
Deferred Tax Liabilities, Undistributed Foreign Earnings 1,600,000    
Computed tax at federal statutory rate 117,679,000 128,293,000 (76,778,000)
Federal statutory rate (in hundredths) 35.00% 35.00% 35.00%
Increases (reductions) resulting from [Abstract]      
State income taxes, net of federal income tax benefit (expense) 10,653,000 10,210,000 (7,280,000)
State income tax rate (in hundredths) 3.20% 2.80% 3.30%
Resolution of tax matters and uncertain tax positions (3,906,000) 667,000 881,000
Resolution of tax matters and uncertain tax positions rate (in hundredths) (1.20%) 0.20% (0.40%)
Income tax reconciliation, tax credits, other (3,485,000) (2,185,000) (1,452,000)
Effective income tax rate reduction, tax credits, other (1.00%) (0.60%) 0.70%
Depletion allowance (3,266,000) (2,810,000) (2,320,000)
Depletion allowance rate (in hundredths) (1.00%) (0.80%) 1.00%
Deductible K-Plan dividends (2,282,000) (2,309,000) (2,369,000)
Deductible K-Plan dividends rate (in hundredths) (0.70%) (0.60%) 1.10%
Foreign operations (391,000) (588,000) (1,148,000)
Foreign operations rate (in hundredths) (0.10%) (0.20%) 0.50%
Domestic production activities deduction 0 0 (856,000)
Domestic production activities deduction rate (in hundredths) 0.00% 0.00% 0.40%
Other (4,728,000) (8,748,000) (4,770,000)
Other rate (in hundredths) (1.40%) (2.40%) 2.20%
Total income tax expense (benefit) $ 110,274,000 $ 122,530,000 $ (96,092,000)
Total income tax expense (benefit) rate (in hundredths) 32.80% 33.40% 43.80%