Business Combinations - Assets and Liabilities (Details) - USD ($) $ in Thousands	Aug. 21, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Liabilities assumed:
Goodwill		$ 57,541	$ 49,704	$ 67,274
Advanced Technical Solutions
Tangible assets acquired:
Accounts receivable	$ 185
Inventory	312
Other assets	389
Total tangible assets acquired	886
Liabilities assumed:
Accounts payable and accrued liabilities	(355)
Total liabilities assumed	(355)
Intangible assets	1,295
Net assets acquired	1,826
Deferred income tax liability	(277)
Goodwill	5,467
Contingent consideration	(980)
Purchase price paid, net of cash acquired	6,036
Contingent consideration	980
Total purchase price	$ 7,016