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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stock options |  |  |  |
Additional disclosures |  |  |  |
Fair value of stock options vested | $ 33,900 | $ 24,200 | $ 12,900 |
2001 Stock Plan, 2011 Stock Plan and 2015 Stock Plan |  |  |  |
Number of Shares Underlying Options |  |  |  |
Outstanding at beginning of period (in shares) | 6,307 | 7,026 | 5,911 |
Granted (in shares) | 186 | 896 | 1,877 |
Replacement Awards (in shares) | 803 |  |  |
Exercised (in shares) | (696) | (1,304) | (639) |
Canceled/forfeited/expired (in shares) | (17) | (311) | (123) |
Outstanding at end of period (in shares) | 6,583 | 6,307 | 7,026 | 5,911
Vested and expected to vest at end of period (in shares) | 6,418 |  |  |
Exercisable at end of period (in shares) | 4,985 |  |  |
Weighted Average Exercise Price |  |  |  |
Outstanding at beginning of period (in dollars per share) | $ 23.69 | $ 21.36 | $ 12.59 |
Granted (in dollars per share) | 68.10 | 30.83 | 43.85 |
Replacement Awards (in dollars per share) | 13.64 |  |  |
Exercised (in dollars per share) | 21.53 | 14.27 | 5.76 |
Canceled/forfeited/expired (in dollars per share) | 42.75 | 31.14 | 23.79 |
Outstanding at end of period (in dollars per share) | 23.91 | $ 23.69 | $ 21.36 | $ 12.59
Vested and expected to vest at end of period (in dollars per share) | 24.16 |  |  |
Exercisable at end of period (in dollars per share) | $ 19.71 |  |  |
Additional disclosures |  |  |  |
Weighted Average Remaining Contractual Life | 6 years 1 month 6 days | 6 years 8 months 12 days | 7 years 3 months 18 days | 7 years 3 months 18 days
Weighted Average Remaining Contractual Life, Vested and expected to vest at end of period | 6 years 2 months 12 days |  |  |
Weighted Average Remaining Contractual Life, Exercisable at end of period | 5 years 6 months |  |  |
Aggregate Intrinsic Value for outstanding options | $ 204,062 | $ 204,896 | $ 69,555 | $ 129,591
Exercised, Aggregate Intrinsic Value | 33,132 | $ 46,639 | $ 22,105 |
Vested and expected to vest, Aggregate Intrinsic Value | 197,261 |  |  |
Exercisable, Aggregate Intrinsic Value | $ 173,590 |  |  |

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