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Segment Information Segment Reporting (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Segment
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Segment Reporting Information [Line Items]          
Sales Revenue, Goods, Net $ 80,397 $ 75,006 $ 155,367 $ 149,623  
Sales Revenue, Services, Net 9,985 0 $ 19,474 0  
Number of Reportable Segments | Segment     2    
Total revenue 90,382 75,006 $ 174,841 149,623  
Gross Profit 49,131 45,141 95,349 90,020  
Operating Income (Loss) 5,554 7,891 7,391 8,603  
Interest Expense 264 166 504 260  
Other Nonoperating Income (Expense) (777) (115) (490) 110  
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest 4,513 7,610 6,397 8,453  
Lawson [Member]          
Segment Reporting Information [Line Items]          
Sales Revenue, Goods, Net 70,632   137,569 149,623  
Sales Revenue, Services, Net 9,985 0      
Total revenue 80,617 75,006 157,043 149,623  
Gross Profit, Product 38,703 45,141 75,549   $ 90,020
Gross Profit, Services 6,590 0 12,670 0  
Gross Profit 45,297 45,141 88,219 90,020  
Operating Income (Loss) 4,660   6,017 8,603  
Bolt [Member] [Member]          
Segment Reporting Information [Line Items]          
Total revenue 9,765 0 17,798 0  
Gross Profit 3,834 0 7,130 0  
Operating Income (Loss) $ 894 $ 0 $ 1,374 $ 0