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Income Tax (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Income Tax Provision (Benefit) on Income from Operations

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

	Years Ended December 31,
	2017				2016				2015
Current:
Federal	$	22,882			$	41,366			$	44,841
State	4,666				7,023				6,670
	27,548				48,389				51,511
Deferred	(29,865		)		(28,939		)		(7,956		)
	$	(2,317	)		$	19,450			$	43,555

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,
	2017				2016				2015
Federal income tax expense at statutory rate	$	56,570			$	45,257			$	37,949
State income tax, net of federal income tax benefit	4,824				4,807				3,715
Domestic production activities deduction	(2,617		)		(3,947		)		(466		)
Excess tax benefits related to stock option exercises	(40,624		)		(29,582		)		—
Tax Act adjustments	(21,625		)		—				—
Tax credits	(3,578		)		—				—
Non-deductible business expenses	4,573				2,979				2,414
Other, net	160				(64		)		(57		)
	$	(2,317	)		$	19,450			$	43,555

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:

	2017				2016
Deferred income tax assets:
Operating expenses not currently deductible	$	11,232			$	18,721
Stock option and other employee benefit plans	15,932				19,665
Total deferred income tax assets	27,164				38,386
Deferred income tax liabilities:
Intangible assets	(60,189		)		(103,754		)
Property and equipment	(5,699		)		(3,207		)
Other	(190		)		(204		)
Total deferred income tax liabilities	(66,078		)		(107,165		)
Net deferred income tax liabilities	$	(38,914	)		$	(68,779	)

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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