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Foreign Operations, Geographic Area and Product Segment Information (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets
Depreciation and amortization	$ 18,425	$ 16,192	$ 12,892
Expenditures for long-lived assets	9,174	24,994	60,364
Operating segment | LED And Solar
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets
Depreciation and amortization	14,365	12,020	8,320
Expenditures for long-lived assets	6,796	20,279	56,141
Operating segment | Data Storage
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets
Depreciation and amortization	2,907	3,008	3,245
Expenditures for long-lived assets	1,271	3,341	2,703
Unallocated
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets
Depreciation and amortization	1,153	1,164	1,327
Expenditures for long-lived assets	$ 1,108	$ 1,374	$ 1,520

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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X

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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