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Equity-Based Compensation - Components of Share-Based Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expenses $ 41,876 $ 153,951 $ 13,638
Compensation expense (including $270, $0 and $0 amortization of fair value of dividend equivalent right)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expenses 41,876 149,820 13,638
Amortization of fair value of dividend equivalent right 270 0 0
Earnings from investments in unconsolidated ventures      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expenses 0 61 0
Investment and servicing expense      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expenses $ 0 $ 4,070 $ 0