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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