Summary of Significant Accounting Policies - Schedule of Adoption of ASU 2016-13 (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity	$ 2,000,837	$ 1,973,501		$ 2,201,350	$ 2,663,118	$ 2,816,912	$ 2,845,202
Retained Earnings (Accumulated Deficit)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity	$ (1,186,754)	$ (959,695)		(819,738)	$ (397,398)	$ (234,145)	$ (193,327)
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity				(23,186)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings (Accumulated Deficit)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity				$ (22,644)
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings (Accumulated Deficit)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity			$ 23,186
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment | CECL reserve on Loans and preferred equity held for investment, net
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity			21,093
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment | CECL reserve on Accrued and other liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity			$ 2,093