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Share-based Compensation and Equity - Equity Award Modifications (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 19, 2017 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Exercise prices (in dollars per share) |  |  | $ 19.30 | $ 18.18 | $ 18.79 | $ 19.30 | $ 21.81
Number of stock options outstanding (in shares) |  |  | 9,903 | 5,388 | 9,020 | 9,903 | 10,928
Stock compensation expense |  |  |  | $ 12,994 | $ 10,791 | $ 64,788 |
Stock compensation expense not yet recognized, options |  |  |  | $ 2,891 |  |  |
Stock options, net of estimated forfeitures |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock compensation expense |  |  | $ 15,000 |  |  |  |
Class A Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Average stock closing price period | 20 days |  |  |  |  |  |
Exercise prices (in dollars per share) | $ 17.44 |  |  |  |  |  |
Class A Common Stock | Weighted Average |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share price (in dollars per share) | $ 17.44 |  |  |  |  |  |
Class B Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of stock options outstanding (in shares) | 5,300 |  |  |  |  |  |
Class B Common Stock | Stock options, net of estimated forfeitures |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock compensation expense |  | $ 5,100 |  |  |  |  |
Stock compensation expense not yet recognized, options | $ 2,500 |  |  |  |  |  |

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