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Income Taxes, Unrecognized Tax Benefits (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary of unrecognized income tax benefits      
Unrecognized tax benefit, beginning balance $ 32,547,000 $ 34,442,000 $ 27,786,000
Additions for tax positions of current year 4,487,000 5,119,000 4,966,000
Additions for tax positions of prior years 332,000 550,000 3,114,000
Reductions for tax positions of prior years (1,104,000) (1,560,000) (1,399,000)
Reductions for settlements of tax positions (244,000) (5,938,000)  
Reductions for lapses in statutes of limitations (7,273,000) (66,000) (25,000)
Unrecognized tax benefit, ending balance 28,745,000 32,547,000 34,442,000
Effect of unrecognized tax benefit on income tax expense $ 18,700,000 $ 21,100,000 $ 18,900,000