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Stockholders' Equity - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Tax payments, for net share settlement of share based award | $ 4,051 | $ 14,127 | $ 3,453 |
Incremental stock option expense | $ 37,400 |  |  |
Weighted average period | 6 years |  |  |
Performance Based Restricted Stock Unit |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Approximate units of performance restricted stock granted (in shares) | 6,000,000.0 | 100,000 | 400,000 |
Performance criteria met for approximate units (in shares) | 100,000 |  |  |
Approximate units outstanding (in shares) | 400,000 |  |  |
Incremental stock option expense | $ 24,100 | $ 4,800 | $ 2,500 |
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock price on the last trading day of the period (in dollars per share) | $ 73.28 |  |  |
Aggregate intrinsic value, RSUs vested | $ 39,400 | $ 36,600 | $ 14,500 |
Shares withheld, for net share settlement of share based award (in shares) | 100,000 |  |  |
Tax payments, for net share settlement of share based award | $ 3,500 |  |  |
Performance criteria met for approximate units (in shares) | 650,000 | 772,000 | 519,000 |
Approximate units outstanding (in shares) | 7,282,000 | 1,655,000 | 2,348,000 | 1,330,000
Unrecognized stock-based compensation expense related to non-vested stock options | $ 190,800 |  |  |
Weighted average period | 4 years 10 months 24 days |  |  |
eXponential Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Approximate units of performance restricted stock granted (in shares) | 5,900,000 |  |  |
Incremental stock option expense | $ 17,500 |  |  |
Minimum | Performance Based Restricted Stock Unit |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of targeted shares earned that can vest | 0.00% |  |  |
Maximum | Performance Based Restricted Stock Unit |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of targeted shares earned that can vest | 200.00% |  |  |

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