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Segment Information Segment Reporting (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Segment
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Segment Reporting Information [Line Items]          
Sales Revenue, Goods, Net $ 78,377 $ 75,651 $ 233,744 $ 225,274  
Sales Revenue, Services, Net 10,153 0 $ 29,627    
Number of Reportable Segments | Segment     2    
Total revenue 88,530 75,651 $ 263,371 225,274  
Gross Profit 48,108 46,005 143,457 136,025  
Operating Income (Loss) (2,266) 1,090 5,125 9,693  
Interest Expense 251 133 755 393  
Other Nonoperating Income (Expense) 170 843 (320) 953  
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest (2,347) 1,800 4,050 10,253  
Lawson [Member]          
Segment Reporting Information [Line Items]          
Sales Revenue, Goods, Net 68,539   206,108 225,274  
Sales Revenue, Services, Net 10,153 0 29,627 0  
Total revenue 78,692 75,651 235,735 225,274  
Gross Profit, Product 37,742 46,005 113,291   $ 136,025
Gross Profit, Services 6,710 0 19,380 0  
Gross Profit 44,452 46,005 132,671 136,025  
Operating Income (Loss) (2,955)   3,062 9,693  
Bolt [Member] [Member]          
Segment Reporting Information [Line Items]          
Total revenue 9,838 0 27,636 0  
Gross Profit 3,656 0 10,786 0  
Operating Income (Loss) $ 689 $ 0 $ 2,063 $ 0