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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 349,637 | $ 305,907
Sales Revenue, Net |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 100.00% | 100.00%
Fastening Systems | Product Concentration Risk | Sales Revenue, Net |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 24.00% | 21.00%
Cutting Tools and Abrasives | Product Concentration Risk | Sales Revenue, Net |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 15.00% | 14.00%
Fluid Power | Product Concentration Risk | Sales Revenue, Net |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 14.00% | 15.00%
Specialty Chemicals | Product Concentration Risk | Sales Revenue, Net |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 12.00% | 14.00%
Electrical | Product Concentration Risk | Sales Revenue, Net |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 11.00% | 11.00%
Aftermarket Automotive Supplies | Product Concentration Risk | Sales Revenue, Net |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 8.00% | 9.00%
Safety | Product Concentration Risk | Sales Revenue, Net |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 5.00% | 4.00%
Welding and Metal Repair | Product Concentration Risk | Sales Revenue, Net |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 2.00% | 2.00%
Other | Product Concentration Risk | Sales Revenue, Net |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 9.00% | 10.00%
United States |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 279,917 | $ 266,994
Canada |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 69,720 | $ 38,913

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