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Fair Value Measurements - Schedule of reconciliation of the balances for all investments measured at fair value using significant unobservable inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Assets
Asset fair value, beginning balance	$ 0	$ 107,075
Transfers in to (out of) Level 3	0	0
Purchases	4,000	76,973
Sales	0	(177,570)
Realized and Unrealized Gains (Losses)	0	(6,478)
Asset fair value, ending balance	4,000	0
Liabilities
Liability fair value, beginning balance	(22)	(2,256)
Transfers in to (out of) Level 3	0	0
Purchases	0	0
Sales	0	1,797
Realized and Unrealized Gains(Losses) (2)	(9)	437
Liability fair value, ending balance	(31)	(22)
Derivative liabilities (free standing)
Liabilities
Liability fair value, beginning balance	0	(2,085)
Transfers in to (out of) Level 3		0
Purchases		0
Sales		1,797
Realized and Unrealized Gains(Losses) (2)		288
Liability fair value, ending balance		0
Derivative liabilities (embedded)
Liabilities
Liability fair value, beginning balance	(22)	(171)
Transfers in to (out of) Level 3	0	0
Purchases	0	0
Sales	0	0
Realized and Unrealized Gains(Losses) (2)	(9)	149
Liability fair value, ending balance	(31)	(22)
Private Common Equity Securities
Assets
Asset fair value, beginning balance	0	4,794
Transfers in to (out of) Level 3	0	0
Purchases	1,000	567
Sales	0	(4,726)
Realized and Unrealized Gains (Losses)	0	(635)
Asset fair value, ending balance	1,000	0
Private preferred equity securities
Assets
Asset fair value, beginning balance	0	57,126
Transfers in to (out of) Level 3	0	0
Purchases	3,000	38,376
Sales	0	(91,065)
Realized and Unrealized Gains (Losses)	0	(4,437)
Asset fair value, ending balance	3,000	0
Asset-backed securities
Assets
Asset fair value, beginning balance	0	27,308
Transfers in to (out of) Level 3		0
Purchases		35,905
Sales		(60,906)
Realized and Unrealized Gains (Losses)		(2,307)
Asset fair value, ending balance		0
Corporate bonds
Assets
Asset fair value, beginning balance	0	9,868
Transfers in to (out of) Level 3		0
Purchases		1,372
Sales		(11,763)
Realized and Unrealized Gains (Losses)		523
Asset fair value, ending balance		0
Other debt securities
Assets
Asset fair value, beginning balance	0	713
Transfers in to (out of) Level 3		0
Purchases		0
Sales		(913)
Realized and Unrealized Gains (Losses)		200
Asset fair value, ending balance		0
Rights and warrants
Assets
Asset fair value, beginning balance	0	435
Transfers in to (out of) Level 3		0
Purchases		753
Sales		(1,380)
Realized and Unrealized Gains (Losses)		192
Asset fair value, ending balance		0
Real estate
Assets
Asset fair value, beginning balance	$ 0	6,831
Transfers in to (out of) Level 3		0
Purchases		0
Sales		(6,817)
Realized and Unrealized Gains (Losses)		(14)
Asset fair value, ending balance		$ 0

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy.

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