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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