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CONDENSED CONSOLIDATED INCOME STATEMENTS (UNAUDITED) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement [Abstract]        
Revenues $ 63,146 $ 39,329 $ 160,222 $ 94,176
Cost of goods sold 40,595 26,297 110,686 67,360
Gross profit 22,551 13,032 49,536 26,816
Operating expenses:        
Salaries, benefits and payroll taxes 3,232 1,838 8,595 5,702
Depreciation and amortization 501 148 1,165 377
Selling, general and administrative 3,512 2,275 10,208 6,592
Gain on contingent consideration (2,100) 0 (2,100) 0
Total operating expenses 5,145 4,261 17,868 12,671
Operating income 17,406 8,771 31,668 14,145
Other income (expenses):        
Interest expense, net (758) (114) (1,438) (340)
Other income 90 76 149 197
Total other expenses, net (668) (38) (1,289) (143)
Income before income tax expense 16,738 8,733 30,379 14,002
Income tax expense 4,613 1,686 7,258 3,354
Net income $ 12,125 $ 7,047 $ 23,121 $ 10,648
Net income per common share:        
Basic (in dollars per share) $ 0.30 $ 0.17 $ 0.57 $ 0.27
Diluted (in dollars per share) $ 0.30 $ 0.17 $ 0.57 $ 0.26
Weighted-average number of common shares:        
Basic (in shares) 40,541 40,384 40,483 40,145
Diluted (in shares) 40,551 40,416 40,548 40,257