CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Statement Abstract
NET SALES	$ 635,251	$ 612,886	$ 434,357
COST OF GOODS SOLD	441,554	388,017	313,150
Gross profit	193,697	224,869	121,207
OPERATING EXPENSES
Selling, general and administrative	89,974	88,784	70,396
Research and development	27,231	26,584	23,757
Amortization of acquisition related intangible assets and other	4,503	4,569	4,225
Total operating expenses	121,708	119,937	98,378
Income from operations	71,989	104,932	22,829
OTHER INCOME (EXPENSES)
Interest income	1,024	2,842	4,871
Interest expense	(3,139)	(5,229)	(7,471)
Amortization of debt discount	(6,032)	(7,656)	(8,302)
Other	(178)	3,214	(777)
Total other income (expenses)	(8,325)	(6,829)	(11,679)
Income before income taxes and noncontrolling interest	63,664	98,103	11,150
INCOME TAX PROVISION	10,157	17,839	1,302
NET INCOME	53,507	80,264	9,848
Less: NET INCOME attributable to noncontrolling interest	(2,770)	(3,531)	(2,335)
NET INCOME attributable to common stockholders	$ 50,737	$ 76,733	$ 7,513
EARNINGS PER SHARE attributable to common stockholders
Basic	$ 1.12	$ 1.74	$ 0.18
Diluted	$ 1.09	$ 1.68	$ 0.17
Number of shares used in computation
Basic	45,202	44,146	42,237
Diluted	46,713	45,546	43,449