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Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock options |  |  |  |
Additional disclosures |  |  |  |
Fair value of stock options vested | $ 10,300 | $ 20,300 | $ 33,900 |
2001 Stock Plan, 2011 Stock Plan and 2015 Stock Plan |  |  |  |
Number of Shares Underlying Options |  |  |  |
Outstanding at beginning of period (in shares) | 5,984 | 6,583 | 6,307 |
Granted (in shares) | 50 | 880 | 186 |
Replacement Awards (in shares) |  |  | 803 |
Adjustments to certain prior year grants (in shares) | (47) |  |  |
Exercised (in shares) | (1,303) | (1,403) | (696) |
Canceled/forfeited/expired (in shares) | (142) | (76) | (17) |
Outstanding at end of period (in shares) | 4,542 | 5,984 | 6,583 | 6,307
Vested and expected to vest at end of period (in shares) | 5,316 |  |  |
Exercisable at end of period (in shares) | 3,942 |  |  |
Weighted Average Exercise Price |  |  |  |
Outstanding at beginning of period (in dollars per share) | $ 27.59 | $ 23.91 | $ 21.36 |
Granted (in dollars per share) | 60.74 | 38.15 | 68.10 |
Adjustments to certain prior year grants (in dollars per share) | 33.38 |  |  |
Replacement Awards (in dollars per share) |  |  | 13.64 |
Exercised (in dollars per share) | 20.07 | 14.42 | 21.53 |
Canceled/forfeited/expired (in dollars per share) | 52.15 | 42.13 | 42.75 |
Outstanding at end of period (in dollars per share) | 29.30 | $ 27.59 | $ 23.91 | $ 21.36
Vested and expected to vest at end of period (in dollars per share) | 22.92 |  |  |
Exercisable at end of period (in dollars per share) | $ 27.39 |  |  |
Additional disclosures |  |  |  |
Weighted Average Remaining Contractual Life | 5 years | 5 years 8 months 12 days | 6 years 1 month 6 days | 7 years 3 months 18 days
Weighted Average Remaining Contractual Life, Vested and expected to vest at end of period | 3 years 9 months 18 days |  |  |
Weighted Average Remaining Contractual Life, Exercisable at end of period | 4 years 6 months |  |  |
Aggregate Intrinsic Value for outstanding options | $ 74,039 | $ 285,366 | $ 204,062 | $ 69,555
Exercised, Aggregate Intrinsic Value | 68,162 | $ 50,093 | $ 33,132 |
Vested and expected to vest, Aggregate Intrinsic Value | 119,428 |  |  |
Exercisable, Aggregate Intrinsic Value | $ 70,336 |  |  |
Vesting based on performance | 2001 Stock Plan, 2011 Stock Plan and 2015 Stock Plan |  |  |  |
Number of Shares Underlying Options |  |  |  |
Vested and expected to vest at end of period (in shares) | 276 |  |  |

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