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Consolidated statements of operations and comprehensive income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 267,435	$ 269,888	$ 229,567
Cost of sales	104,694	105,163	97,332
Gross profit	162,741	164,725	132,235
Selling, general, and administrative expenses	136,579	131,446	109,156
Operating income	26,162	33,279	23,079
Other income (expense), net	(390)	(2,035)	3,016
Interest expense, net	(7,816)	(8,775)	(16,283)
Income before provision for income taxes	17,956	22,469	9,812
Income tax benefit (provision)	(2,431)	11,006	(4,499)
Net income	15,525	33,475	5,313
Comprehensive income	$ 15,525	$ 33,475	$ 5,313
Net income (loss) per share:
Basic (in USD per share)	$ 0.33	$ 0.74	$ (39.47)
Diluted (in USD per share)	$ 0.32	$ 0.68	$ (39.47)
Weighted average shares outstanding:
Basic (in shares)	46,828,798	45,358,452	12,606,529
Diluted (in shares)	49,268,616	49,374,758	12,606,529

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