Fair Value Measurements and Disclosures (Details) - Fair Value - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets and Liabilities at Fair Value
Total assets	$ 151,679	$ 31,824
Total liabilities	(110,417)	(3,613)
Net asset (fair value)	41,262	28,211
Significant Other Observable Inputs (Level 2)
Assets and Liabilities at Fair Value
Total assets	130,134	22,886
Total liabilities	(79,658)	(3,089)
Net asset (fair value)	50,476	19,797
Significant Unobservable Inputs (Level 3)
Assets and Liabilities at Fair Value
Total assets	21,545	8,938
Total liabilities	(30,759)	(524)
Net asset (fair value)	$ (9,214)	$ 8,414