CONDENSED CONSOLIDATED STATEMENT OF INCOME (LOSS) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net sales	$ 142,820	$ 129,134	$ 401,252	$ 374,584
Cost of sales	91,634	86,157	264,347	258,550
Gross margin	51,186	42,977	136,905	116,034
Selling and administrative expenses	25,582	26,074	76,335	72,640
Research and development expenses	5,364	4,808	16,883	14,606
Restructuring and impairment charges	1,231	1,766	5,756	9,949
Operating income (loss)	19,009	10,329	37,931	18,839
Equity income in unconsolidated joint ventures	1,754	1,773	3,045	3,735
Other income (expense), net	(101)	19	(867)	140
Realized investment gain (loss):
Increase (decrease) in fair value of investments	0	0	0	(522)
Less: Portion reclassified to/from other comprehensive income	0	0	0	2,723
Net realized gain (loss)	0	0	0	(3,245)
Interest income (expense), net	(881)	(1,104)	(2,616)	(3,366)
Income (loss) before income tax expense (benefit)	19,781	11,017	37,493	16,103
Income tax expense (benefit)	6,209	(48,107)	11,361	(47,852)
Income (loss) from continuing operations	13,572	59,124	26,132	63,955
Income (loss) from discontinued operations, net of income taxes	0	(148)	102	(333)
Net income (loss)	$ 13,572	$ 58,976	$ 26,234	$ 63,622
Basic net income (loss) per share:
Income (loss) from continuing operations (dollars per share)	$ 0.79	$ 3.59	$ 1.52	$ 3.91
Income (loss) from discontinued operations (dollars per share)		$ (0.01)	$ 0.01	$ (0.02)
Net income (loss) (dollars per share)	$ 0.79	$ 3.58	$ 1.53	$ 3.89
Diluted net income (loss) per share:
Income (loss) from continuing operations (dollars per share)	$ 0.76	$ 3.47	$ 1.48	$ 3.78
Income (loss) from discontinued operations (in dollars per share)		$ (0.01)	$ 0.01	$ (0.02)
Net income (loss) (in dollars per share)	$ 0.76	$ 3.46	$ 1.49	$ 3.76
Shares used in computing:
Basic (shares)	17,244,831	16,484,957	17,141,672	16,342,289
Diluted (shares)	17,863,035	17,024,137	17,711,972	16,903,224