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Segment Information Segment Reporting (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($) Segment | Mar. 31, 2018 USD ($)
Segment Reporting [Abstract] |  |
Number of Reportable Segments | Segment | 2 |
Segment Reporting Information [Line Items] |  |
Total revenue | $ 91,343 | $ 84,459
Gross Profit | 48,923 | 46,218
Operating Income (Loss) | 5,544 | 1,837
Interest Expense | 197 | 240
Other Nonoperating Income (Expense) | 472 | 287
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | 5,819 | 1,884
Lawson [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 82,467 | 76,426
Gross Profit | 45,619 | 42,922
Operating Income (Loss) | 5,263 | 1,357
Bolt [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 8,876 | 8,033
Gross Profit | 3,304 | 3,296
Operating Income (Loss) | 281 | 480
Product [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 81,915 | 74,970
Product [Member] | Lawson [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 73,039 | 66,937
Gross Profit | 40,604 | 36,842
Service [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 9,428 | 9,489
Service [Member] | Lawson [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 9,428 |
Gross Profit | $ 5,015 | $ 6,080

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