Income Taxes - Activity in Valuation Allowance (Details) - Deferred tax asset valuation allowance - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Valuation allowance activities
Balance at Beginning of Year	$ 2,112	$ 2,065	$ 8,930
Acquisitions	0	0	0
Provision	(37)	47	238
Released	0	0	7,103
Balance at End of Year	$ 2,075	$ 2,112	$ 2,065