Fair Value Measurements (Details 4) - Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gain on Sale of Investments	$ 49,341	$ 10,609	$ 8,669
Proceeds from Issuance of Warrants	(50,092)	(9,828)	(10,239)
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants	432	424	324
Equity Warrants Transfers to Available For Sale Securities	$ (646)	(119)	113
Warrants Not Settleable in Cash, Fair Value Disclosure		$ 4,520	$ 3,434	$ 4,793