CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net sales	$ 130,248	$ 147,344	$ 378,292	$ 426,773
Cost of sales	87,288	96,598	262,018	284,914
Gross margin	42,960	50,746	116,274	141,859
Selling and administrative expenses	26,255	27,462	73,117	78,001
Research and development expenses	4,838	5,361	14,685	16,198
Restructuring and impairment charges	1,766		9,980
Operating income (loss)	10,101	17,923	18,492	47,660
Equity income in unconsolidated joint ventures	1,773	1,290	3,735	4,041
Other income (expense), net	19	302	141	1,931
Realized investment gain (loss):
Increase (decrease) in fair value of investments		(642)	(522)	58
Less: Portion reclassified to/from other comprehensive income		(407)	2,723	261
Net realized gain (loss)		(235)	(3,245)	(203)
Interest income (expense), net	(1,104)	(1,040)	(3,366)	(3,884)
Income (loss) before income tax expense (benefit)	10,789	18,240	15,757	49,545
Income tax expense (benefit)	(48,187)	2,579	(47,973)	9,390
Income (loss) from continuing operations	58,976	15,661	63,730	40,155
Income (loss) from discontinued operations, net of income taxes		(1,305)	(108)	(4,236)
Net income (loss)	58,976	14,356	63,622	35,919
Basic net income (loss) per share:
Income (loss) from continuing operations (in dollars per share)	$ 3.58	$ 0.97	$ 3.90	$ 2.52
Income (loss) from discontinued operations		$ (0.08)	$ (0.01)	$ (0.27)
Net income (loss)	$ 3.58	$ 0.89	$ 3.89	$ 2.25
Diluted net income (loss) per share:
Income (loss) from continuing operations (in dollars per share)	$ 3.46	$ 0.93	$ 3.77	$ 2.40
Income (loss) from discontinued operations		$ (0.08)	$ (0.01)	$ (0.25)
Net income (loss)	$ 3.46	$ 0.85	$ 3.76	$ 2.15
Comprehensive income (loss)	$ 66,119	$ (5,528)	$ 67,368	$ 40,728
Shares used in computing:
Basic (in shares)	16,484,957	16,106,054	16,342,289	15,981,337
Diluted (in shares)	17,024,137	16,934,423	16,903,224	16,713,837