Business Segments - Long-Lived Assets By Geographical Location (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information
Long-Lived assets	$ 82,314	$ 86,857
United States
Segment Reporting Information
Long-Lived assets	77,101	81,135
United Kingdom
Segment Reporting Information
Long-Lived assets	1,610	1,671
Canada
Segment Reporting Information
Long-Lived assets	3,590	4,036
Other
Segment Reporting Information
Long-Lived assets	$ 13	$ 15