Components of Income (Loss) Before Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income (loss) before income taxes:
Income before income taxes	$ 48,403	$ 45,766	$ 61,302
CANADA
Income (loss) before income taxes:
Foreign	(2,278)	78	(796)
UNITED STATES
Income (loss) before income taxes:
U.S.	16,875	25,577	39,356
Other Countries
Income (loss) before income taxes:
Foreign	$ 33,806	$ 20,111	$ 22,742