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Intangible Assets and Goodwill (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended			12 Months Ended
	Dec. 31, 2011 segment	Dec. 31, 2011 Semiconductor Business Group (SBG)	Dec. 31, 2010 Semiconductor Business Group (SBG)	Dec. 31, 2011 CRI	Dec. 31, 2011 Lighting and Display Technology group (LDT)	Dec. 31, 2010 Lighting and Display Technology group (LDT)
Goodwill information for each reporting unit
Balance at the beginning of the period	$ 18,154	$ 4,454	$ 4,454		$ 13,700	$ 13,700
Addition to goodwill	96,994			96,994
Balance at the end of the period	$ 115,148	$ 4,454	$ 4,454	$ 96,994	$ 13,700	$ 13,700
Number of reporting units post CRI acquisition	4
Number of reporting units with goodwill allocated	3

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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