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Income Tax (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Income Tax Provision (Benefit) on Income from Operations

The Income tax provision (benefit) on income from operations consists of the following:

	Years Ended December 31,
	2018				2017				2016
					As Adjusted				As Adjusted
Current:
Federal	$	9,110			$	22,883			$	41,366
State	4,367				4,666				7,023
	13,477				27,549				48,389
Deferred	(5,069		)		(33,664		)		(26,432		)
	$	8,408			$	(6,115	)		$	21,957

Reconciliation of U.S. Statutory Income Tax Rate to Effective Income Tax Expense Rate

Reconciliation of the U.S. statutory income tax rate to our effective income tax expense rate for operations follows:

	Years Ended December 31,
	2018				2017				2016
					As Adjusted				As Adjusted
Federal income tax expense at statutory rate	$	32,733			$	57,209			$	47,480
State income tax, net of federal income tax benefit	7,953				4,754				5,091
Domestic production activities deduction	—				(2,617		)		(3,947		)
Excess tax benefits related to stock option exercises	(32,487		)		(40,624		)		(29,582		)
Tax Act adjustments	(1,750		)		(25,992		)		—
Tax credits	(3,715		)		(3,578		)		—
Non-deductible business expenses	5,655				4,573				2,979
Other, net	19				160				(64		)
	$	8,408			$	(6,115	)		$	21,957

Schedule of Deferred Tax Assets and Liabilities

The tax effects of the major items recorded as deferred tax assets and liabilities as of December 31 are:

	2018				2017
					As Adjusted
Deferred income tax assets:
Operating expenses not currently deductible	$	8,989			$	9,714
Stock option and other employee benefit plans	19,496				15,932
Loss and credit carryforwards	17,999				—
Total deferred income tax assets	46,484				25,646
Valuation allowance	(1,049		)		—
Total deferred income tax assets, net of valuation allowance	45,435				25,646
Deferred income tax liabilities:
Intangible assets	(70,752		)		(60,189		)
Property and equipment	(8,455		)		(5,699		)
Prepaid expenses	(4,079		)		(190		)
Deferred revenue	(3,940		)		(6,447		)
Total deferred income tax liabilities	(87,226		)		(72,525		)
Net deferred income tax liabilities	$	(41,791	)		$	(46,879	)

Summary of Positions for which Significant Change in Unrecognized Tax Benefits

The aggregate changes in the balance of unrecognized tax benefits were as follows:

	2018
Balance at beginning of year	$	—
Increases for tax positions related to prior years	1,929
Balance at end of year	$	1,929

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of the change in unrecognized tax benefits.

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