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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
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, |  | 2016 |  | 2015 |  | 2014
Current |  |  |  |  |  |
Federal |  | $ | 158,411 |  |  | $ | 159,774 |  |  | $ | 155,273 |
State |  | 10,500 |  |  | 7,756 |  |  | 8,744 |
Foreign |  | 5,137 |  |  | 5,224 |  |  | 5,254 |
|  | 174,048 |  |  | 172,754 |  |  | 169,271 |
Deferred |  |  |  |  |  |
Federal |  | 788 |  |  | (5,343 | ) |  | 1,667 |
State |  | (168 | ) |  | 1,414 |  |  | 11 |
|  | 620 |  |  | (3,929 | ) |  | 1,678 |
Total income taxes |  | $ | 174,668 |  |  | $ | 168,825 |  |  | $ | 170,949 |
Components of Net Income Before Income Taxes | The components of Income before income taxes are summarized as follows:
Year Ended December 31, |  | 2016 |  | 2015 |  | 2014
Domestic |  | $ | 481,760 |  |  | $ | 472,384 |  |  | $ | 475,175 |
Foreign |  | 26,725 |  |  | 28,096 |  |  | 14,487 |
|  | $ | 508,485 |  |  | $ | 500,480 |  |  | $ | 489,662 |
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, | 2016 |  | 2015 |  | 2014
Statutory rate | 35.0 | % |  | 35.0 | % |  | 35.0 | %
State taxes, net of federal tax benefit | 1.3 |  |  | 1.6 |  |  | 1.2 |
Foreign tax expense and tax rate differential | (0.8 | ) |  | (1.2 | ) |  | (0.7 | )
Research and development tax credit | (0.8 | ) |  | (0.6 | ) |  | (0.4 | )
Domestic Production Activities Deduction | (0.6 | ) |  | (0.6 | ) |  | (0.4 | )
Net change in uncertain tax positions | — |  |  | — |  |  | 0.3 |
Settlement of state tax petition | — |  |  | (0.8 | ) |  | — |
Other, net | 0.2 |  |  | 0.3 |  |  | (0.1 | )
| 34.3 | % |  | 33.7 | % |  | 34.9 | %
Schedule of Deferred Tax Assets and Liabilities | Significant components of our deferred tax assets and liabilities at December 31, 2016 and 2015 are as follows:
Year Ended December 31, |  | 2016 |  | 2015
Deferred Tax Assets: |  |  |  |
Stock-based compensation expense |  | $ | 33,459 |  |  | $ | 34,739 |
Foreign and state net operating loss carryforward |  | 20,049 |  |  | 19,580 |
Basis differences in investments |  | 6,165 |  |  | 6,439 |
Federal benefit of state tax deduction for uncertain tax positions |  | 3,647 |  |  | 3,014 |
Revenue and expense recognized in different periods for financial reporting and income tax purposes |  | 5,022 |  |  | 4,675 |
Other assets |  | 813 |  |  | 1,793 |
Total deferred income tax assets |  | 69,155 |  |  | 70,240 |
Less: valuation allowance |  | (17,922 | ) |  | (14,548 | )
Net deferred income tax assets |  | $ | 51,233 |  |  | $ | 55,692 |
Deferred Tax Liabilities: |  |  |  |
Capitalized software currently deductible for tax purposes, net of amortization |  | $ | (107,897 | ) |  | $ | (111,174 | )
Difference in financial reporting and income tax depreciation methods |  | (5,190 | ) |  | (2,695 | )
Difference between book and tax basis of other assets |  | (4,597 | ) |  | (4,294 | )
Other liabilities |  | (1,115 | ) |  | (557 | )
Total deferred income tax liabilities |  | $ | (118,799 | ) |  | $ | (118,720 | )
Net deferred income tax liabilities |  | $ | (67,566 | ) |  | $ | (63,028 | )
Schedule of Unrecognized Tax Benefits Roll Forward | A reconciliation of the beginning and ending amount of unrecognized tax benefit is as follows:
|  | 2016 |  | 2015 |  | 2014
Balance as of January 1 |  | $ | 14,517 |  |  | $ | 14,018 |  |  | $ | 12,028 |
Tax positions related to current year: |  |  |  |  |  |
Gross additions |  | 3,756 |  |  | 1,954 |  |  | 1,957 |
Tax positions related to prior years: |  |  |  |  |  |
Gross additions |  | 1,762 |  |  | 297 |  |  | 1,369 |
Settlements |  | (378 | ) |  | — |  |  | — |
Lapses on statute of limitations |  | (2,370 | ) |  | (1,752 | ) |  | (1,336 | )
Balance as of December 31 |  | $ | 17,287 |  |  | $ | 14,517 |  |  | $ | 14,018 |

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