Business Segments - Long-Lived Assets By Geographical Location (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information
Long-Lived assets	$ 62,085	$ 60,435
United States
Segment Reporting Information
Long-Lived assets	57,445	55,222
Canada
Segment Reporting Information
Long-Lived assets	3,011	3,590
United Kingdom
Segment Reporting Information
Long-Lived assets	1,617	1,610
Other
Segment Reporting Information
Long-Lived assets	$ 12	$ 13