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Income Taxes (Tables) | 12 Months Ended
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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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