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Acquisition - Initial Purchase Price Allocation (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Aug. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
Fair value of assets acquired |  |  |  |  |
Goodwill | $ 36,428 |  | $ 20,923 | $ 20,582 | $ 20,079
Partsmaster [Member] |  |  |  |  |
Cash paid and payable and liabilities assumed |  |  |  |  |
Cash paid and payable |  | $ 34,711 |  |  |
Accounts payable and accrued expenses |  | 4,076 |  |  |
Deferred compensation |  | 2,938 |  |  |
Cash paid and payable and liabilities assumed |  | 41,725 |  |  |
Fair value of assets acquired |  |  |  |  |
Goodwill |  | 15,952 |  |  |
Inventories |  | 7,809 |  |  |
Accounts receivable |  | 7,656 |  |  |
Property, plant and equipment |  | 2,201 |  |  |
Other assets |  | 371 |  |  |
Fair value of assets acquired |  | 41,725 |  |  |
Partsmaster [Member] | Customer Relationships [Member] |  |  |  |  |
Fair value of assets acquired |  |  |  |  |
Intangibles |  | 4,961 |  |  |
Partsmaster [Member] | Trade Names [Member] |  |  |  |  |
Fair value of assets acquired |  |  |  |  |
Intangibles |  | $ 2,775 |  |  |

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