Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Selected Quarterly Financial Information [Abstract]
Net sales	$ 268,430	$ 285,247	$ 264,224	$ 236,303	$ 232,085	$ 250,694	$ 236,645	$ 222,738	$ 1,054,204	$ 942,162	$ 848,904
Gross profit	96,379	96,347	90,139	73,911	67,263	80,623	74,817	64,220	356,776	286,923	248,583
Net income (loss) attributable to common shareholders	$ (30,651)	$ 14,450	$ 13,179	$ 1,217	$ 1,268	$ 10,648	$ 5,752	$ (1,733)	$ (1,805)	$ 15,935	$ 24,274
Earnings (loss) per share attributable to common shareholders
Basic	$ (0.62)	$ 0.29	$ 0.27	$ 0.03	$ 0.07	$ 0.22	$ 0.12	$ (0.04)	$ (0.04)	$ 0.33	$ 0.50
Diluted	$ (0.62)	$ 0.29	$ 0.26	$ 0.02	$ 0.07	$ 0.21	$ 0.12	$ (0.04)	$ (0.04)	$ 0.32	$ 0.49

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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