Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Selected Quarterly Financial Information [Abstract]

Schedule of Quarterly Financial Data

	1st Quarter			2nd Quarter		3rd Quarter		4th Quarter
2017
Net sales	$	236,303		$	264,224	$	285,247	$	268,430
Gross profit		73,911			90,139		96,347		96,379
Net income (loss) attributable to common shareholders		1,217			13,179		14,450		(30,651	)
Earnings (loss) per share attributable to common shareholders
Basic	$	0.03		$	0.27	$	0.29	$	(0.62	)
Diluted	$	0.02		$	0.26	$	0.29	$	(0.62	)
	1st Quarter			2nd Quarter		3rd Quarter		4th Quarter
2016
Net sales	$	222,738		$	236,645	$	250,694	$	232,085
Gross profit		64,220			74,817		80,623		67,263
(Loss) net income attributable to common shareholders		(1,733	)		5,752		10,648		1,268
(Loss) earnings per share attributable to common shareholders
Basic	$	(0.04	)	$	0.12	$	0.22	$	0.07
Diluted	$	(0.04	)	$	0.12	$	0.21	$	0.07