CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Operations [Abstract]
NET SALES	$ 224,510	$ 166,617	$ 615,853	$ 470,519
COST OF GOODS SOLD	154,951	123,012	438,818	352,180
Gross profit	69,559	43,605	177,035	118,339
OPERATING EXPENSES
Selling, general and administrative	33,810	25,796	99,266	72,702
Research and development	13,611	9,084	35,836	24,466
Other operating (income) expenses	1,876	1,203	7,657	(155)
Total operating expenses	49,297	36,083	142,759	97,013
Income from operations	20,262	7,522	34,276	21,326
OTHER INCOME (EXPENSES)	(2,768)	1,923	(1,970)	2,861
Income before income taxes and noncontrolling interest	17,494	9,445	32,306	24,187
INCOME TAX PROVISION	3,604	509	11,653	1,983
NET INCOME	13,890	8,936	20,653	22,204
Less: NET INCOME attributable to noncontrolling interest	(271)	(383)	(325)	(2,127)
NET INCOME attributable to common stockholders	$ 13,619	$ 8,553	$ 20,328	$ 20,077
EARNINGS PER SHARE attributable to common stockholders
Basic	$ 0.29	$ 0.19	$ 0.44	$ 0.44
Diluted	$ 0.28	$ 0.18	$ 0.43	$ 0.43
Number of shares used in computation
Basic	46,605	45,997	46,260	45,702
Diluted	48,023	46,995	47,584	46,901