CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net sales	$ 553,150	$ 378,201	$ 291,597
Cost of sales	374,070	240,757	209,369
Gross margin	179,080	137,444	82,228
Selling and administrative expenses	104,219	88,775	68,000
Research and development expenses	21,617	17,447	17,394
Restructuring and impairment charges	441		22,661
Operating income (loss)	52,803	31,222	(25,827)
Equity income in unconsolidated joint ventures	5,451	8,658	5,462
Other income (expense), net	1,941	1,364	1,056
Realized investment loss, net:
Increase (decrease) in fair value of investments	(14)	1,271	1,507
Less: Portion of gains (losses) in other comprehensive income	182	1,824	1,871
Net realized investment gain (loss)	(196)	(553)	(364)
Interest income (expense), net	(4,911)	184	377
Gain on acquisition or disposal		3,173	2,908
Income (loss) from continuing operations before income taxes	55,088	44,048	(16,388)
Income tax expense	11,282	5,727	42,749
Income (loss) from continuing operations	43,806	38,321	(59,137)
Loss from discontinued operations, net of taxes	(6,751)	(3,750)	(3,733)
Net income (loss)	$ 37,055	$ 34,571	$ (62,870)
Basic net income (loss) per share:
Income (loss) from continuing operations	$ 2.73	$ 2.43	$ (3.77)
Loss from discontinued operations	$ (0.42)	$ (0.24)	$ (0.24)
Net Income (loss)	$ 2.31	$ 2.19	$ (4.01)
Diluted net income (loss) per share
Income (loss) from continuing operations	$ 2.62	$ 2.39	$ (3.77)
Loss from discontinued operations	$ (0.41)	$ (0.23)	$ (0.24)
Net Income (loss)	$ 2.21	$ 2.16	$ (4.01)
Shares used in computing earnings per share:
Basic	16,035,882	15,800,913	15,691,579
Diluted	16,737,711	16,005,662	15,691,579