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Segment Information Segment Reporting (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) Segment | Sep. 30, 2018 USD ($)
Segment Reporting [Abstract] |  |  |  |
Number of Reportable Segments | Segment |  |  | 2 |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 94,779 | $ 88,530 | $ 282,219 | $ 263,371
Gross profit | 50,574 | 48,108 | 150,540 | 143,457
Operating Income (Loss) | 6,446 | (2,266) | 13,613 | 5,125
Interest Expense | 138 | 251 | 481 | 755
Other Nonoperating Income (Expense) | (13) | 170 | 798 | (320)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | 6,295 | (2,347) | 13,930 | 4,050
Lawson [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 83,461 | 78,692 | 250,895 | 235,735
Gross profit | 46,148 | 44,452 | 138,524 | 132,671
Operating Income (Loss) | 5,377 | (2,754) | 11,490 | 3,530
Bolt [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 11,318 | 9,838 | 31,324 | 27,636
Gross profit | 4,426 | 3,656 | 12,016 | 10,786
Operating Income (Loss) | 1,069 | 488 | 2,123 | 1,595
Product [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 84,440 | 78,377 | 252,351 | 233,744
Product [Member] | Lawson [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 73,122 | 68,539 | 221,027 | 206,108
Gross profit | 40,379 | 37,742 | 122,113 | 113,291
Service [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 10,339 | 10,153 | 29,868 | 29,627
Service [Member] | Lawson [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross profit | $ 5,769 | $ 6,710 | $ 16,411 | $ 19,380

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