Segment Information (Details 2) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets
Goodwill	$ 56,271	$ 52,003	$ 52,003
Total assets	934,223	1,148,034
Led And Solar
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets
Goodwill	56,271	52,003
Total assets	349,498	323,096
Data Storage
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets
Total assets	58,089	61,691
Unallocated Corporate Amount
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets
Total assets	$ 526,636	$ 763,247

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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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details