Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental disclosures:
Interest paid	$ 0	$ 0	$ 0
Income taxes paid, net	7,891	13,754	2,172
Non-cash investing and financing activities:
Non-cash capital expenditures	$ (3,714)	$ 2,843	$ 863