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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

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,						2020						2019						2018
Current
Federal						$	92,649					$	100,986					$	82,493
State						21,479						19,902						13,709
Foreign						8,256						11,722						8,405
						122,384						132,610						104,607
Deferred
Federal						(701)						(1,635)						2,550
State						(275)						(960)						1,166
Foreign						—						—						15
						(976)						(2,595)						3,731
Total income taxes						$	121,408					$	130,015					$	108,338

Schedule of Components of Net Income Before Income Taxes

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

Year Ended December 31,						2020						2019						2018
Domestic						$	517,451					$	565,842					$	579,622
Foreign						51,243						65,599						34,584
						$	568,694					$	631,441					$	614,206

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,			2020						2019						2018
Statutory rate			21.0		%				21.0		%				21.0		%
State taxes, net of federal tax benefit			3.0						2.4						1.9
Foreign tax expense and tax rate differential			(0.4)						—						(0.1)
Tax benefit from stock option exercises			(1.1)						(1.9)						(3.8)
Research and development tax credit			(1.0)						(1.1)						(0.8)
Foreign-Derived Intangible Income Deduction (FDII)			(0.3)						(0.2)						(0.2)
Other, net			0.1						0.4						(0.4)
			21.3		%				20.6		%				17.6		%

Schedule of Deferred Tax Assets and Liabilities

Significant components of deferred tax assets and liabilities at December 31, 2020 and 2019 are as follows:

						2020						2019
Deferred Tax Assets:
Stock-based compensation expense						$	26,893					$	24,686
State net operating loss carryforward						65,114						67,472
Foreign net operating loss carryforward and other						6,634						6,081
Basis differences in investments						3,965						4,436
Federal benefit of state tax deduction for uncertain tax positions						2,255						2,124
Revenue and expense recognized in different periods for financial reporting and income tax purposes						3,025						1,960
Other assets						1,584						1,271
Total deferred income tax assets						109,470						108,030
Less: State net operating loss valuation allowance						(62,229)						(64,737)
Less: Foreign net operating loss valuation allowance						(6,547)						(5,994)
Net deferred income tax assets						$	40,694					$	37,299
Deferred Tax Liabilities:
Capitalized software currently deductible for tax purposes, net of amortization						$	(63,588)					$	(68,265)
Difference in financial reporting and income tax depreciation methods						(11,422)						(6,032)
Difference between book and tax basis of other assets						(5,747)						(4,593)
Goodwill and other intangibles						(2,462)						(2,170)
Foreign dividend withholding tax						—						(312)
Capitalized contract costs						(7,762)						(7,072)
Other liabilities						(1,900)						(1,755)
Total deferred income tax liabilities						$	(92,881)					$	(90,199)
Net deferred income tax liabilities						$	(52,187)					$	(52,900)

Schedule of Unrecognized Tax Benefits Roll Forward

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

						2020						2019						2018
Balance as of January 1						$	15,356					$	14,367					$	14,480
Tax positions related to current year:
Gross additions						3,352						3,054						2,446
Tax positions related to prior years:
Gross additions						236						1,465						340
Settlements						—						(145)						(278)
Lapses on statute of limitations						(3,033)						(3,385)						(2,621)
Balance as of December 31						$	15,911					$	15,356					$	14,367

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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 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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