Acquisitions - Contingent Earn-out Obligation (Details) $ in Thousands		3 Months Ended
	Apr. 01, 2020 USD ($) Milestone	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Business Acquisition [Line Items]
Revenues		$ 669,761	$ 700,131
TAS Energy
Business Acquisition [Line Items]
Contingent consideration earn-out milestones achieved | Milestone	2
Contingent earn-out period	27 months
Contingent earn-out estimated milestone payment, minimum	$ 1,000
Contingent earn-out estimated milestone payment, maximum	$ 8,000
Cash flow discount rate	17.70%
TAS Energy | Federal
Business Acquisition [Line Items]
Net operating loss carryforwards	$ 53,200
TAS Energy | State
Business Acquisition [Line Items]
Net operating loss carryforwards	$ 6,500
TAS Energy | Minimum
Business Acquisition [Line Items]
Cash flow discount rate	15.00%
TAS Energy | Maximum
Business Acquisition [Line Items]
Cash flow discount rate	23.50%