Business Combinations - Consideration Transferred (Details) - USD ($) $ in Thousands	Sep. 17, 2019	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Business Acquisition [Line Items]
Excess of total consideration over net assets acquired		$ 27,816	$ 25,188	$ 7,624	$ 7,587	$ 7,576	$ 7,374	$ 7,658	$ 7,941
First Source Electronics, LLC
Business Acquisition [Line Items]
Initial cash paid, net of working capital adjustment	$ 34,000
Contingent consideration at fair value	4,700
Total consideration	38,700
Net assets at fair value	18,335
Excess of total consideration over net assets acquired	$ 20,365