Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 item	Jun. 30, 2011
Segment Information
Number of reportable segments			2
Reconciliation of Segment profit (loss) to Income (loss) from continuing operations before income tax
Net sales	$ 136,547	$ 264,815	$ 276,456	$ 519,491
Segment profit (loss)	20,319	88,021	45,673	178,937
Interest, net	(329)	86	(532)	1,385
Amortization	1,185	1,334	2,400	2,242
Equity-based compensation	4,014	3,717	7,144	6,517
Restructuring			63
Loss on extinguishment of debt		3,045		3,349
Income from continuing operations before income taxes	15,449	79,839	36,598	165,444
LED And Solar
Reconciliation of Segment profit (loss) to Income (loss) from continuing operations before income tax
Net sales	86,778	219,135	182,352	433,833
Segment profit (loss)	9,587	79,052	27,073	160,029
Amortization	861	953	1,724	1,440
Equity-based compensation	1,096	892	2,102	1,571
Restructuring			58
Income from continuing operations before income taxes	7,630	77,207	23,189	157,018
Data Storage
Reconciliation of Segment profit (loss) to Income (loss) from continuing operations before income tax
Net sales	49,769	45,680	94,104	85,658
Segment profit (loss)	12,136	13,050	21,089	25,281
Amortization	324	356	676	719
Equity-based compensation	440	352	851	660
Restructuring			5
Income from continuing operations before income taxes	11,372	12,342	19,557	23,902
Unallocated Corporate Amount
Reconciliation of Segment profit (loss) to Income (loss) from continuing operations before income tax
Segment profit (loss)	(1,404)	(4,081)	(2,489)	(6,373)
Interest, net	(329)	86	(532)	1,385
Amortization		25		83
Equity-based compensation	2,478	2,473	4,191	4,286
Loss on extinguishment of debt		3,045		3,349
Income from continuing operations before income taxes	$ (3,553)	$ (9,710)	$ (6,148)	$ (15,476)