Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2011

Selected Quarterly Financial Information [Abstract]

Schedule Of Quarterly Financial Information [Table Text Block]

			Quarter Ended
			March 31		June 30		Sept. 30		Dec. 31
Fiscal 2011
	Net sales	$	161,555	$	169,806	$	160,577	$	143,313
	Gross profit		57,393		55,615		45,194		35,495
	Net income attributable to common shareholders		19,684		17,981		9,957		3,115
	Earnings per share attributable to common shareholders
	Basic	$	0.44	$	0.38	$	0.22	$	0.07
	Diluted		0.42		0.37		0.21		0.07
			Quarter Ended
			March 31		June 30		Sept. 30		Dec. 31
Fiscal 2010
	Net sales	$	136,847	$	149,153	$	163,120	$	163,767
	Gross profit		47,783		53,467		60,977		62,643
	Net income attributable to common shareholders		14,958		16,647		21,162		23,967
	Earnings per share attributable to common shareholders
	Basic	$	0.34	$	0.38	$	0.48	$	0.54
	Diluted		0.33		0.37		0.46		0.52