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Share-based Compensation and Equity - Other Stockholders' Equity Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 23, 2018 | Dec. 04, 2016 | Sep. 30, 2019 | Jun. 30, 2019 | Nov. 30, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  |  |  |  |  | $ 0 | $ (61,974) | $ 0
Gain upon conversion of Series A convertible redeemable preferred stock |  |  |  |  |  | $ 0 | $ 0 | $ (74,110) | $ 0 | $ 0 | 74,110 | 0
Series A Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  |  |  |  |  |  |  | (292,450)
Series A Redeemable Convertible Preferred Stock - Beneficial Conversion Feature |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  |  |  |  |  |  | $ 265,368 |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.004 |  |  |  |  | $ 0.004 |  |  |  | $ 0.004 | $ 0.004 |
Sale of stock, number of shares issued in transaction (in shares) |  |  | 0 | 0 |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from initial public offering |  | $ 400,000 |  |  |  |  |  |  |  |  |  |
Private Placement | Series A Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares agreed to be issued in transaction (in shares) |  | 400,000 |  |  |  |  |  |  |  |  |  |
Secondary Offering | Class A Common Stock | KKR Capital Markets |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued in secondary offering (in shares) |  |  |  |  | 757,000 |  |  |  |  |  |  |
Additional paid-in capital | Series A Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accretion to redemption value |  |  |  |  |  |  |  |  |  |  | $ (61,974) | $ (292,450)
Additional paid-in capital | Series A Redeemable Convertible Preferred Stock - Beneficial Conversion Feature |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accretion period |  |  |  |  |  |  |  |  |  |  | 1 year |
Common Stock | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Class B shares to Class A shares (in shares) | 36,143,000 |  |  |  |  |  |  |  |  | 26,034,000 | 15,638,000 | 1,229,000
Stock issued in secondary offering (in shares) |  |  |  |  |  |  |  |  |  |  |  | 35,000,000
Common Stock | Class A Common Stock | Wengen |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of Series A Preferred Stock upon conversion (in shares) |  |  |  |  | 14,088,000 |  |  |  |  |  |  |
Sale price of stock (in dollars per share) |  |  |  |  | $ 14.00 |  |  |  |  |  |  |
Majority Shareholder | Class A Common Stock | Wengen Alberta |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale price of stock (in dollars per share) |  |  | $ 16.85 | $ 15.3032 |  |  |  |  |  |  |  |
Majority Shareholder | Secondary Offering | Class A Common Stock | Wengen Alberta |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) |  |  | 15,000 | 10,955 |  |  |  |  |  |  |  |

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