Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Taxes

Schedule of components of income tax expense (benefit)

	2016		2017		2018
Income taxes currently payable:
Federal	$	59,343	$	49,944	$	13,593
State		5,675		6,120		7,145
		65,018		56,064		20,738
Deferred income taxes (benefits):
Federal		3,830		(31,941)		307
State		880		960		(2,032)
		4,710		(30,981)		(1,725)
Total income tax expense	$	69,728	$	25,083	$	19,013

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

	2016		2017		2018
Income tax expense at federal statutory rate	$	50,931	$	47,328	$	9,071
State income taxes, net of federal income tax benefit		5,799		4,993		2,968
State contingencies added		2,120		2,161		3,644
Tax contingencies reversed due to statute closings		(1,632)		(2,044)		(2,651)
Change in valuation allowances		2,130		(14,973)		(691)
Adjustments for Tax Act		—		(8,677)		335
Share-based compensation		(232)		(4,724)		(4,750)
Qualified research credit		(1,002)		(1,325)		(1,781)
Non-deductible executive compensation		34		104		3,052
Non-deductible HIF fees		10,204		—		8,246
Other-net		1,376		2,240		1,570
Total income tax expense	$	69,728	$	25,083	$	19,013

Schedule of components of deferred tax assets and liabilities

	2017		2018
Deferred tax assets:
Net operating loss carryforwards	$	13,384	$	11,159
Share-based compensation		9,639		10,299
Other accrued compensation		6,195		5,508
Claims reserves		4,527		7,053
Deferred revenue		2,606		4,368
Other non-deductible accrued liabilities		5,362		6,057
Indirect tax benefits		2,847		3,296
Other deferred tax assets		2,051		2,130
Total deferred tax assets		46,611		49,870
Valuation allowances		(2,368)		(1,521)
Deferred tax assets after valuation allowances		44,243		48,349
Deferred tax liabilities:
Depreciation		(22,906)		(21,350)
Amortization of goodwill and intangible assets		(29,501)		(30,463)
Other deferred tax liabilities		(3,321)		(4,292)
Total deferred tax liabilities		(55,728)		(56,105)
Net deferred tax assets (liabilities)	$	(11,485)	$	(7,756)

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

	2016		2017		2018
Balance as of beginning of period	$	12,597	$	13,604	$	13,580
Additions for current year tax positions		3,274		3,243		4,955
Additions for tax positions of prior years		141		342		512
Reductions for tax positions of prior years		(173)		(114)		(398)
Reductions due to lapses of applicable statutes of limitations		(2,235)		(2,693)		(3,005)
Changes due to Tax Act		—		(509)		339
Reductions due to settlements with taxing authorities		—		(293)		(300)
Balance as of end of period	$	13,604	$	13,580	$	15,683