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Foreign Operations, Geographic Area and Product Segment Information (Details 4) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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

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