Secured Borrowings- Collateralized Loan Obligations (Details) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) item	Jun. 30, 2020 USD ($) item	Dec. 31, 2019 USD ($) item	Aug. 31, 2019 USD ($)
Summary of CLO
Carrying value	$ 929,307	$ 929,307	$ 928,060
LIBOR | Collateral assets
Summary of CLO
Spread (as a percent)		3.66%	3.34%
LIBOR | Financing
Summary of CLO
Spread (as a percent)		1.64%	1.65%
Collateralized Loan Obligation
Summary of CLO
Amount issued				$ 1,100,000
Principal Amount				86,600
Liquidation preference				$ 77,000
Incurred debt issuance costs		$ 9,200
Amortization of deferred financing costs	600	1,200
Deferred financing costs, net of amortization	$ 7,100	$ 7,100	$ 8,300
Collateralized Loan Obligation | Collateral assets
Summary of CLO
Count | item	24	24	20
Amount issued	$ 1,099,442	$ 1,099,442	$ 1,073,504
Carrying value	$ 1,099,405	$ 1,099,405	$ 1,073,504
Percentage of loans earning a fixed rate		9.00%
Fixed weighted average interest	6.84%	6.84%
Collateralized Loan Obligation | Financing
Summary of CLO
Count | item	1	1	1
Amount issued	$ 936,375	$ 936,375	$ 936,375
Carrying value	$ 929,307	$ 929,307	$ 928,060