Investments - Gross Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Cost	$ 17,156	$ 50,384
Impairment	(16,677)	(19,605)
Adjustments	(479)	(479)
Reported amount	$ 0	$ 30,300