Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2013

Selected Quarterly Financial Information [Abstract]

Schedule Of Quarterly Financial Information [Table Text Block]

			Quarter Ended
			March 31		June 30		Sept. 30		Dec. 31
Fiscal 2013
	Net sales	$	176,964	$	214,379	$	224,510	$	210,993
	Gross profit		46,183		61,293		69,559		60,801
	Net income (loss) attributable to common shareholders		(1,926)		8,635		13,619		6,204
	Earnings (loss) per share attributable to common shareholders
	Basic	$	(0.04)	$	0.19	$	0.29	$	0.13
	Diluted		(0.04)		0.18		0.28		0.13
			Quarter Ended
			March 31		June 30		Sept. 30		Dec. 31 (i)
Fiscal 2012
	Net sales	$	144,663	$	159,239	$	166,617	$	163,287
	Gross profit		33,706		41,028		43,605		43,247
	Net income attributable to common shareholders		4,871		6,653		8,553		4,075
	Earnings per share attributable to common shareholders
	Basic	$	0.11	$	0.15	$	0.19	$	0.09
	Diluted		0.10		0.14		0.18		0.09