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Income Taxes (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes                      
Federal net operating loss carryforwards $ 4,800,000               $ 4,800,000    
Income taxes currently payable:                      
Federal                 51,195,000 34,235,000 17,003,000
State                 5,534,000 6,722,000 4,443,000
Aggregate income taxes currently payable                 56,729,000 40,957,000 21,446,000
Deferred income taxes:                      
Federal                 8,644,000 44,310,000 40,348,000
State                 (336,000) (1,523,000) (4,457,000)
Aggregate deferred income taxes                 8,308,000 42,787,000 35,891,000
Total income tax expense 13,570,000 4,829,000 23,575,000 23,063,000 12,244,000 28,137,000 25,348,000 18,015,000 65,037,000 83,744,000 57,337,000
Statutory federal income tax rate (as a percent)                 35.00%    
Reconciliation of income tax provision to that computed by applying the statutory federal income tax rate                      
Income tax provision at federal statutory income tax rate                 68,458,000 77,841,000 57,403,000
State income taxes, net of federal income tax benefit                 7,013,000 7,491,000 6,805,000
Tax contingencies reversed due to statute closings                 (12,521,000) (3,002,000) (5,763,000)
Net change in valuation allowances                 (1,163,000) (2,554,000) (4,342,000)
Other-net                 3,250,000 3,968,000 3,234,000
Total income tax expense 13,570,000 4,829,000 23,575,000 23,063,000 12,244,000 28,137,000 25,348,000 18,015,000 65,037,000 83,744,000 57,337,000
Deferred tax assets:                      
Intangible assets         2,966,000         2,966,000  
Accrued compensation 3,258,000       3,404,000       3,258,000 3,404,000  
Operating loss carryforwards 10,969,000       12,936,000       10,969,000 12,936,000  
Stock compensation 13,431,000       15,094,000       13,431,000 15,094,000  
Community reinvestment reserves 8,065,000       5,420,000       8,065,000 5,420,000  
Other non-deductible book accruals 5,543,000       4,480,000       5,543,000 4,480,000  
Claims reserves 5,438,000       5,703,000       5,438,000 5,703,000  
Self-insured medical reserves 4,167,000       2,448,000       4,167,000 2,448,000  
Refundable tax credits         4,855,000         4,855,000  
Indirect tax benefits 6,947,000       8,506,000       6,947,000 8,506,000  
Other 7,344,000       5,287,000       7,344,000 5,287,000  
Total deferred tax assets 65,162,000       71,099,000       65,162,000 71,099,000  
Valuation allowance (3,424,000)       (5,319,000)       (3,424,000) (5,319,000)  
Deferred tax assets after valuation allowance 61,738,000       65,780,000       61,738,000 65,780,000  
Deferred tax liabilities:                      
Property and depreciation (37,712,000)       (33,356,000)       (37,712,000) (33,356,000)  
Intangible assets (7,358,000)               (7,358,000)    
Other liabilities (39,000)       (3,160,000)       (39,000) (3,160,000)  
Total deferred tax liabilities (45,109,000)       (36,516,000)       (45,109,000) (36,516,000)  
Net deferred tax assets 16,629,000       29,264,000       16,629,000 29,264,000  
Unrecognized tax benefits                      
Balance as of beginning of period       111,594,000       113,100,000 111,594,000 113,100,000 129,157,000
Additions based on tax positions related to the current year                 3,240,000 3,317,000 4,023,000
Additions for tax positions of prior years                 948,000 422,000 4,759,000
Reductions for tax positions of prior years                 (1,492,000) (1,916,000) (17,866,000)
Reductions due to lapses of applicable statutes of limitations                 (15,011,000) (3,329,000) (6,822,000)
Settlements                 (49,000)   (151,000)
Balance as of end of period 99,230,000       111,594,000       99,230,000 111,594,000 113,100,000
Unrecognized tax benefits, if realized would have impacted effective tax rate 80,300,000       88,200,000       80,300,000 88,200,000  
Unrecognized tax benefits that could be reversed as a result of statute expiration 43,200,000       15,000,000       43,200,000 15,000,000  
Unrecognized tax benefit to be reversed due to statute expiration which would impact the income tax expense 35,600,000       10,400,000       35,600,000 10,400,000  
Unrecognized tax benefit to be reversed due to statute expiration which would impact additional paid-in capital 6,200,000       2,500,000       6,200,000 2,500,000  
Accrued interest and penalties related to unrecognized tax benefits 2,800,000       3,700,000       2,800,000 3,700,000  
Interest and penalties recorded                 $ (900,000) $ 200,000 $ (700,000)