Acquisitions - Advantage (Details) - USD ($) $ in Thousands				3 Months Ended		12 Months Ended			20 Months Ended
	Apr. 03, 2019	Jul. 28, 2017	Jul. 01, 2017	Mar. 31, 2019	Sep. 30, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 28, 2019
Business Acquisition [Line Items]
Cash consideration						$ 0	$ 0	$ 1,930
Advantage
Business Acquisition [Line Items]
Cash consideration			$ 86,600
Cash acquired			2,800
Purchase price			88,000
Net working capital adjustment			600
Reimbursement from working capital adjustment settled					$ 800
Contingent liability									$ 100
Release of remaining contingent liability									$ 500
Escrow payment related to tax liabilities			14,500
Escrow payment related to post-close liabilities			7,500
Release of escrow to seller	$ 2,900	$ 7,300		$ 7,000
Escrow deposit related to tax liabilities		$ 7,200
Escrow disbursed to pay taxes	$ 4,300
Escrow deposit related to post close liabilities				$ 500
Deferred Consideration Transferred | Advantage
Business Acquisition [Line Items]
Contingent liability			$ 600
Period of deferred consideration			20 months