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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Federal and State and Foreign Income Tax Provision

The federal and state and foreign income tax provision is summarized as follows: 

Year Ended December 31,		2019				2018				2017
Current
Federal		$	100,986			$	82,493			$	154,776
State		19,902				13,709				11,645
Foreign		11,722				8,405				8,002
		132,610				104,607				174,423
Deferred
Federal		(1,635		)		2,550				(26,350		)
State		(960		)		1,166				1,378
Foreign		—				15				3,199
		(2,595		)		3,731				(21,773		)
Total income taxes		$	130,015			$	108,338			$	152,650

Schedule of Components of Net Income Before Income Taxes

The components of Income before income taxes are summarized as follows:

Year Ended December 31,		2019				2018				2017
Domestic		$	565,842			$	579,622			$	523,044
Foreign		65,599				34,584				33,995
		$	631,441			$	614,206			$	557,039

Schedule of Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate

The effective income tax rate differs from the federal income tax statutory rate due to the following:

Year Ended December 31,	2019			2018			2017
Statutory rate	21.0	%		21.0	%		35.0	%
State taxes, net of federal tax benefit	2.4			1.9			1.3
Foreign tax expense and tax rate differential	—			(0.1	)		(1.1	)
Tax benefit from stock option exercises	(1.9	)		(3.8	)		(3.9	)
Enactment of the Tax Cuts and Jobs Act:
Re-measurement of deferred taxes	—			—			(4.9	)
One-time transition tax on repatriation of foreign earnings and withholding tax	—			(0.1	)		2.6
Research and development tax credit	(1.1	)		(0.8	)		(0.9	)
Domestic Production Activities Deduction	—			—			(0.5	)
Foreign-Derived Intangible Income Deduction (FDII)	(0.2	)		(0.2	)		—
Other, net	0.4			(0.3	)		(0.2	)
	20.6	%		17.6	%		27.4	%

Schedule of Deferred Tax Assets and Liabilities

Significant components of our deferred tax assets and liabilities at December 31, 2019 and 2018 are as follows:

		2019				2018
Deferred Tax Assets:
Stock-based compensation expense		$	24,686			$	24,125
State net operating loss carryforward		67,472				67,825
Foreign net operating loss carryforward and other		6,081				6,533
Basis differences in investments		4,436				4,118
Federal benefit of state tax deduction for uncertain tax positions		2,124				1,882
Revenue and expense recognized in different periods for financial reporting and income tax purposes		1,960				1,657
Other assets		1,271				1,049
Total deferred income tax assets		108,030				107,189
Less: State net operating loss valuation allowance		(64,737		)		(65,870		)
Less: Foreign net operating loss valuation allowance		(5,994		)		(6,446		)
Net deferred income tax assets		$	37,299			$	34,873
Deferred Tax Liabilities:
Capitalized software currently deductible for tax purposes, net of amortization		$	(68,265	)		$	(71,067	)
Difference in financial reporting and income tax depreciation methods		(6,032		)		(6,545		)
Difference between book and tax basis of other assets		(4,593		)		(4,429		)
Goodwill and other intangibles		(2,170		)		(1,823		)
Foreign dividend withholding tax		(312		)		(312		)
Capitalized contract costs		(7,072		)		(5,490		)
Other liabilities		(1,755		)		(960		)
Total deferred income tax liabilities		$	(90,199	)		$	(90,626	)
Net deferred income tax liabilities		$	(52,900	)		$	(55,753	)

Schedule of Unrecognized Tax Benefits Roll Forward

A reconciliation of the beginning and ending amount of unrecognized tax benefit is as follows:

		2019				2018				2017
Balance as of January 1		$	14,367			$	14,480			$	17,287
Tax positions related to current year:
Gross additions		3,054				2,446				3,180
Tax positions related to prior years:
Gross additions		1,465				340				211
Settlements		(145		)		(278		)		(352		)
Lapses on statute of limitations		(3,385		)		(2,621		)		(5,846		)
Balance as of December 31		$	15,356			$	14,367			$	14,480

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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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