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Income Taxes (Tables) | 12 Months Ended
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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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