Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Taxes

Schedule of components of income tax expense (benefit)

	2015		2016		2017
Income taxes currently payable:
Federal	$	64,227	$	59,343	$	49,944
State		5,181		5,675		6,120
		69,408		65,018		56,064
Deferred income taxes (benefits):
Federal		(26,573)		3,830		(31,941)
State		(426)		880		960
		(26,999)		4,710		(30,981)
Total income tax expense	$	42,409	$	69,728	$	25,083

Schedule of differences between total income tax expense and amount computed using the statutory federal income tax rate

	2015		2016		2017
Income tax expense at federal statutory rate	$	24,891	$	50,931	$	47,328
State income taxes, net of federal income tax benefit		2,158		5,799		4,993
Tax contingencies reversed due to statute closings		(2,223)		(1,632)		(2,044)
Change in valuation allowances		5,174		2,130		(14,973)
Adjustments for Tax Act		—		—		(8,677)
Share-based compensation		165		(232)		(4,724)
Non-deductible HIF fees		9,953		10,204		—
Other-net		2,291		2,528		3,180
Total income tax expense	$	42,409	$	69,728	$	25,083

Schedule of components of deferred tax assets and liabilities

	2016		2017
Deferred tax assets:
Net operating loss carryforwards	$	19,727	$	13,384
Share-based compensation		14,704		9,639
Other accrued compensation		9,313		6,195
Claims reserves		6,251		4,527
Deferred revenue		4,986		2,606
Other non-deductible accrued liabilities		3,460		5,362
Amortization of goodwill and intangible assets		444		—
Indirect tax benefits		4,396		2,847
Other deferred tax assets		3,858		2,051
Total deferred tax assets		67,139		46,611
Valuation allowances		(17,117)		(2,368)
Deferred tax assets after valuation allowances		50,022		44,243
Deferred tax liabilities:
Depreciation		(41,311)		(22,906)
Amortization of goodwill and intangible assets		—		(29,501)
Other deferred tax liabilities		(5,586)		(3,321)
Total deferred tax liabilities		(46,897)		(55,728)
Net deferred tax assets (liabilities)	$	3,125	$	(11,485)

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

	2015		2016		2017
Balance as of beginning of period	$	13,528	$	12,597	$	13,604
Additions for current year tax positions		3,371		3,274		3,243
Additions for tax positions of prior years		949		141		342
Reductions for tax positions of prior years		(1,807)		(173)		(114)
Reductions due to lapses of applicable statutes of limitations		(3,071)		(2,235)		(2,693)
Reductions due to Tax Act		—		—		(509)
Reductions due to settlements with taxing authorities		(373)		—		(293)
Balance as of end of period	$	12,597	$	13,604	$	13,580