Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Net sales	$ 232,085	$ 250,694	$ 236,645	$ 222,738	$ 214,381	$ 208,888	$ 219,453	$ 206,182	$ 942,162	$ 848,904	$ 890,651
Gross profit	67,263	80,623	74,817	64,220	53,597	61,636	69,437	63,913	286,923	248,583	277,279
Net income attributable to common shareholders	$ 1,268	$ 10,648	$ 5,752	$ (1,733)	$ (4,773)	$ 2,837	$ 15,078	$ 11,132	$ 15,935	$ 24,274	$ 63,678
Earnings per share attributable to common shareholders
Basic	$ 0.07	$ 0.22	$ 0.12	$ (0.04)	$ (0.10)	$ 0.06	$ 0.31	$ 0.23	$ 0.33	$ 0.50	$ 1.35
Diluted	$ 0.07	$ 0.21	$ 0.12	$ (0.04)	$ (0.10)	$ 0.06	$ 0.31	$ 0.23	$ 0.32	$ 0.49	$ 1.31