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Segment Information Segment Reporting (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) Segment | Jun. 30, 2018 USD ($)
Segment Reporting [Abstract] |  |  |  |
Number of Reportable Segments | Segment |  |  | 2 |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 96,097 | $ 90,382 | $ 187,440 | $ 174,841
Gross profit | 51,043 | 49,131 | 99,966 | 95,349
Operating Income (Loss) | 1,623 | 5,554 | 7,167 | 7,391
Interest Expense | 146 | 264 | 343 | 504
Other Nonoperating Income (Expense) | 339 | (777) | 811 | (490)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | 1,816 | 4,513 | 7,635 | 6,397
Lawson [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 84,967 | 80,617 | 167,434 | 157,043
Gross profit | 46,757 | 45,297 | 92,376 | 88,219
Operating Income (Loss) | 654 | 4,794 | 6,113 | 6,284
Bolt [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 11,130 | 9,765 | 20,006 | 17,798
Gross profit | 4,286 | 3,834 | 7,590 | 7,130
Operating Income (Loss) | 969 | 760 | 1,054 | 1,107
Product [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 85,996 | 80,397 | 167,911 | 155,367
Product [Member] | Lawson [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 74,866 | 70,632 | 147,905 | 137,569
Gross profit | 41,130 | 38,707 | 81,734 | 75,549
Service [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 10,101 | 9,985 | 19,529 | 19,474
Service [Member] | Lawson [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross profit | $ 5,627 | $ 6,590 | $ 10,642 | $ 12,670

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