CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net sales	$ 126,671	$ 143,501	$ 248,044	$ 279,429
Cost of sales	89,799	94,930	174,731	188,316
Gross margin	36,872	48,571	73,313	91,113
Selling and administrative expenses	22,468	26,436	46,862	50,537
Research and development expenses	4,498	5,628	9,847	10,837
Restructuring and impairment charges	830		8,214
Operating income (loss)	9,076	16,507	8,390	29,739
Equity income in unconsolidated joint ventures	1,305	1,323	1,962	2,751
Other income (expense), net	261	280	122	1,629
Realized investment gain (loss):
Increase (decrease) in fair value of investments		602	(522)	699
Less: Portion reclassified to/from other comprehensive income		573	2,723	667
Net realized gain (loss)		29	(3,245)	32
Interest income (expense), net	(1,072)	(1,265)	(2,262)	(2,843)
Income (loss) before income tax expense (benefit)	9,570	16,874	4,967	31,308
Income tax expense (benefit)	3,115	3,442	213	6,811
Income (loss) from continuing operations	6,455	13,432	4,754	24,497
Income (loss) from discontinued operations, net of income taxes		(1,304)	(108)	(2,934)
Net income (loss)	6,455	12,128	4,646	21,563
Basic net income (loss) per share:
Income (loss) from continuing operations	$ 0.40	$ 0.84	$ 0.29	$ 1.54
Income (loss) from discontinued operations		$ (0.08)	$ (0.01)	$ (0.18)
Net income (loss)	$ 0.40	$ 0.76	$ 0.28	$ 1.36
Diluted net income (loss) per share:
Income (loss) from continuing operations	$ 0.38	$ 0.81	$ 0.28	$ 1.48
Income (loss) from discontinued operations		$ (0.08)	$ (0.01)	$ (0.18)
Net income (loss)	$ 0.38	$ 0.73	$ 0.27	$ 1.30
Comprehensive income (loss)	$ (4,445)	$ 18,846	$ 1,140	$ 43,326
Shares used in computing:
Basic	16,309,053	15,944,483	16,270,955	15,918,978
Diluted	16,864,166	16,678,377	16,842,768	16,603,543