CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Statement Of Operations [Abstract]
NET SALES	$ 159,239	$ 169,806	$ 303,902	$ 331,361
COST OF GOODS SOLD	118,211	114,191	229,168	218,353
Gross profit	41,028	55,615	74,734	113,008
OPERATING EXPENSES
Selling, general and administrative	24,760	22,575	46,906	43,985
Research and development	8,218	6,533	15,382	13,051
Other operating (income) expenses	(254)	1,153	(1,358)	2,288
Total operating expenses	32,724	30,261	60,930	59,324
Income from operations	8,304	25,354	13,804	53,684
OTHER INCOME (EXPENSES)	251	(1,913)	938	(5,144)
Income before income taxes and noncontrolling interest	8,555	23,441	14,742	48,540
INCOME TAX PROVISION	856	4,718	1,474	9,553
NET INCOME	7,699	18,723	13,268	38,987
Less: NET INCOME attributable to noncontrolling interest	(1,046)	(742)	(1,744)	(1,322)
NET INCOME attributable to common stockholders	$ 6,653	$ 17,981	$ 11,524	$ 37,665
EARNINGS PER SHARE attributable to common stockholders
Basic	$ 0.15	$ 0.40	$ 0.25	$ 0.84
Diluted	$ 0.14	$ 0.38	$ 0.25	$ 0.80
Number of shares used in computation
Basic	45,642	45,325	45,551	45,074
Diluted	46,859	47,148	46,916	46,837