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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

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,		2017				2016				2015
Current
Federal		$	154,776			$	158,411			$	159,774
State		11,645				10,500				7,756
Foreign		8,002				5,137				5,224
		174,423				174,048				172,754
Deferred
Federal		(26,350		)		788				(5,343		)
State		1,378				(168		)		1,414
Foreign		3,199				—				—
		(21,773		)		620				(3,929		)
Total income taxes		$	152,650			$	174,668			$	168,825

Components of Net Income Before Income Taxes

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

Year Ended December 31,		2017				2016				2015
Domestic		$	523,044			$	481,760			$	472,384
Foreign		33,995				26,725				28,096
		$	557,039			$	508,485			$	500,480

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,	2017			2016			2015
Statutory rate	35.0	%		35.0	%		35.0	%
State taxes, net of federal tax benefit	1.3			1.3			1.6
Foreign tax expense and tax rate differential	(1.1	)		(0.8	)		(1.2	)
Tax benefit from stock option exercises	(3.9	)		—			—
Enactment of the Tax Cuts and Jobs Act:
Re-measurement of deferred tax liability	(4.9	)		—			—
One-time transition tax on repatriation of foreign earnings and withholding tax	2.6			—			—
Research and development tax credit	(0.9	)		(0.8	)		(0.6	)
Domestic Production Activities Deduction	(0.5	)		(0.6	)		(0.6	)
Settlement of state tax petition	—			—			(0.8	)
Other, net	(0.2	)		0.2			0.3
	27.4	%		34.3	%		33.7	%

Schedule of Deferred Tax Assets and Liabilities

Significant components of our deferred tax assets and liabilities at December 31, 2017 and 2016 are as follows:

		2017				2016
Deferred Tax Assets:
Stock-based compensation expense		$	24,725			$	33,459
Foreign and state net operating loss carryforward		71,236				20,049
Basis differences in investments		4,191				6,165
Federal benefit of state tax deduction for uncertain tax positions		1,918				3,647
Revenue and expense recognized in different periods for financial reporting and income tax purposes		2,631				5,022
Other assets		273				813
Total deferred income tax assets		104,974				69,155
Less: valuation allowance		(68,469		)		(17,922		)
Net deferred income tax assets		$	36,505			$	51,233
Deferred Tax Liabilities:
Capitalized software currently deductible for tax purposes, net of amortization		$	(70,575	)		$	(107,897	)
Difference in financial reporting and income tax depreciation methods		(3,182		)		(5,190		)
Difference between book and tax basis of other assets		(3,549		)		(4,597		)
Goodwill and other intangibles		(1,001		)		—
Foreign Dividend Withholding Tax		(3,199		)		—
Other liabilities		(704		)		(1,115		)
Total deferred income tax liabilities		$	(82,210	)		$	(118,799	)
Net deferred income tax liabilities		$	(45,705	)		$	(67,566	)

Schedule of Unrecognized Tax Benefits Roll Forward

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

		2017				2016				2015
Balance as of January 1		$	17,287			$	14,517			$	14,018
Tax positions related to current year:
Gross additions		3,180				3,756				1,954
Tax positions related to prior years:
Gross additions		211				1,762				297
Settlements		(352		)		(378		)		—
Lapses on statute of limitations		(5,846		)		(2,370		)		(1,752		)
Balance as of December 31		$	14,480			$	17,287			$	14,517

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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 income before income tax between domestic and foreign jurisdictions.

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Tabular disclosure of the change in unrecognized tax benefits.

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