CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net sales	$ 143,685	$ 96,608	$ 279,744	$ 180,545
Cost of sales	95,495	59,273	189,442	112,951
Gross margin	48,190	37,335	90,302	67,594
Selling and administrative expenses	26,837	23,709	51,336	44,683
Research and development expenses	6,175	5,879	12,196	9,422
Operating income	15,178	7,747	26,770	13,489
Equity income in unconsolidated joint ventures	1,323	1,757	2,751	3,975
Other income, net	280	1,055	1,629	1,864
Realized investment loss, net:
Increase (decrease) in fair value of investments	602	(232)	699	644
Less: Portion of gains (losses) in other comprehensive income	573	(112)	667	816
Net realized gain (loss)	29	(120)	32	(172)
Interest income (expense), net	(1,265)	(3)	(2,843)	103
Income before income taxes	15,545	10,436	28,339	19,259
Income tax expense	3,417	2,123	6,776	4,092
Net income	$ 12,128	$ 8,313	$ 21,563	$ 15,167
Net income per share:
Basic	$ 0.76	$ 0.53	$ 1.35	$ 0.96
Diluted	$ 0.73	$ 0.52	$ 1.30	$ 0.95
Shares used in computing:
Basic	15,944,483	15,785,656	15,918,979	15,777,176
Diluted	16,678,377	15,985,195	16,603,543	15,940,857