Secured Borrowings- Collateralized Loan Obligations (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($) item	Aug. 31, 2019 USD ($)
Summary of CLO
Collateralized loan obligations, net	$ 928,683	$ 928,060
LIBOR | Collateral assets
Summary of CLO
Spread (as a percent)	3.38%	3.34%
LIBOR | Financing
Summary of CLO
Spread (as a percent)	1.65%	1.65%
Collateralized Loan Obligation
Summary of CLO
Amount issued			$ 1,100,000
Principal Amount			86,600
Collateralized loan obligations, net			936,400
Amortization of deferred financing costs	$ 600
Deferred financing costs, net of amortization	$ 7,700	$ 8,300	$ 9,200
Collateralized Loan Obligation | Collateral assets
Summary of CLO
Count | item	22	20
Amount issued	$ 1,098,891	$ 1,073,504
Collateralized loan obligations, net	$ 1,098,839	$ 1,073,504
Loans financed by the CLO (as a percent)	9.00%
Fixed weighted average interest	6.84%
Collateralized Loan Obligation | Financing
Summary of CLO
Count | item	1	1
Amount issued	$ 936,375	$ 936,375
Collateralized loan obligations, net	$ 928,683	$ 928,060