Acquisition - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Aug. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair value of assets acquired
Goodwill	$ 35,176		$ 20,923	$ 20,079
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Right Of Use Assets		$ 620
Partsmaster
Cash paid and payable and liabilities assumed
Cash paid and payable		34,523
Accounts payable and accrued expenses		4,086
Lease obligation		620
Deferred compensation		2,938
Cash paid and payable and liabilities assumed		42,167
Fair value of assets acquired
Goodwill		15,816
Inventories		7,797
Accounts receivable		7,706
Property, plant and equipment		2,121
Other assets		371
Fair value of assets acquired		42,167
Partsmaster | Customer relationships
Fair value of assets acquired
Intangibles		4,961
Partsmaster | Trade names
Fair value of assets acquired
Intangibles		$ 2,775