Accrued Acquisition Liability (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 31, 2020	May 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Business Acquisition [Line Items]
Payments for purchase					$ 33,000	$ 0
Implied interest rate	1.80%
Accrued acquisition liability			$ 0		0		$ 32,673
Interest expense			268	$ 72	591	$ 187
Partsmaster
Business Acquisition [Line Items]
Payments for purchase	$ 2,300	$ 33,000
Accrued acquisition liability							$ 32,700
Interest expense			$ 100		$ 300