CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Statement Of Operations [Abstract]
NET SALES	$ 144,663	$ 161,555
COST OF GOODS SOLD	110,957	104,162
Gross profit	33,706	57,393
OPERATING EXPENSES
Selling, general and administrative	22,146	21,410
Research and development	7,164	6,518
Other operating (income) expenses	(1,104)	1,188
Total operating expenses	28,206	29,116
Income from operations	5,500	28,277
OTHER INCOME (EXPENSES)	687	(3,178)
Income before income taxes and noncontrolling interest	6,187	25,099
INCOME TAX PROVISION	618	4,835
NET INCOME	5,569	20,264
Less: NET INCOME attributable to noncontrolling interest	(698)	(580)
NET INCOME attributable to common stockholders	$ 4,871	$ 19,684
EARNINGS PER SHARE attributable to common stockholders
Basic	$ 0.11	$ 0.44
Diluted	$ 0.10	$ 0.42
Number of shares used in computation
Basic	45,460	44,820
Diluted	46,935	46,680