Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes

Schedule of components of income tax (benefit) expense

	2009			2010			2011
Income taxes currently payable:
Federal	$	17,003		$	34,235		$	51,195
State		4,443			6,722			5,534
		21,446			40,957			56,729
Deferred income taxes:
Federal		40,348			44,310			8,644
State		(4,457	)		(1,523	)		(336	)
		35,891			42,787			8,308
Total income tax expense	$	57,337		$	83,744		$	65,037

Schedule of reconciliation of income tax provision to that computed by applying statutory federal income tax rate

	2009			2010			2011
Income tax expense at federal statutory rate	$	57,403		$	77,841		$	68,458
State income taxes, net of federal income tax benefit		6,805			7,491			7,013
Tax contingencies reversed due to statute closings		(5,763	)		(3,002	)		(12,521	)
Net change in valuation allowances		(4,342	)		(2,554	)		(1,163	)
Other—net		3,234			3,968			3,250
Total income tax expense	$	57,337		$	83,744		$	65,037

Schedule of components of deferred tax assets and liabilities

	2010			2011
Deferred tax assets:
Intangible assets	$	2,966		$	—
Accrued compensation		3,404			3,258
Operating loss carryforwards		12,936			10,969
Stock compensation		15,094			13,431
Community reinvestment reserves		5,420			8,065
Other non-deductible book accruals		4,480			5,543
Claims reserves		5,703			5,438
Self-insured medical reserves		2,448			4,167
Refundable tax credits		4,855			—
Indirect tax benefits		8,506			6,947
Other		5,287			7,344
Total deferred tax assets		71,099			65,162
Valuation allowance		(5,319	)		(3,424	)
Deferred tax assets after valuation allowance		65,780			61,738
Deferred tax liabilities:
Property and depreciation		(33,356	)		(37,712	)
Intangible assets		—			(7,358	)
Other liabilities		(3,160	)		(39	)
Total deferred tax liabilities		(36,516	)		(45,109	)
Net deferred tax assets	$	29,264		$	16,629

Schedule of reconciliation of the beginning and ending amount of gross unrecognized tax benefits

	2009			2010			2011
Balance as of beginning of period	$	129,157		$	113,100		$	111,594
Additions based on tax positions related to the current year		4,023			3,317			3,240
Additions for tax positions of prior years		4,759			422			948
Reductions for tax positions of prior years		(17,866	)		(1,916	)		(1,492	)
Reductions due to lapses of applicable statutes of limitations		(6,822	)		(3,329	)		(15,011	)
Settlements		(151	)		—			(49	)
Balance as of end of period	$	113,100		$	111,594		$	99,230