Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Uncertain Tax Positions
Balance at beginning of year	$ 4,866	$ 3,712	$ 2,983
Increases for prior positions	2,359	0	7
Increases for current year positions	1,746	1,154	724
Other increases	0	0	0
Decreases due to settlements	(1,415)	0	0
Expiration of the statute of limitations for the assessment of taxes	0	0	0
Other decreases	0	0	(2)
Balance at end of year	$ 7,556	$ 4,866	$ 3,712