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Investments in Privately-held Companies (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Summary of investments [Abstract] |  |  |  |  |
Investments, consolidated | $ 4,333,000 |  | $ 4,333,000 |  | $ 1,998,000
Equity Method Investment by Parent | 6,937,000 |  | 6,937,000 |  | 7,049,000
Number of consolidated joint ventures | 3 |  | 3 |  | 3
Income from three consolidated joint ventures | 2,700,000 | 4,500,000 | 5,300,000 | 7,100,000 |
Income allocated to minority interests | 1,128,000 | 2,006,000 | 2,445,000 | 3,085,000 |
Net income from joint ventures attributable to parent | 1,600,000 | 2,500,000 | 2,800,000 | 4,000,000 |
Number of entities not considered as variable interest entities | 3 |  | 3 |  | 3
Net equity earnings (losses) from three minority-owned joint ventures that are not consolidated, recorded as other expenses | (91,000) | 309,000 | (128,000) | 382,000 |
Net income generated by all joint ventures, consolidated and equity method investments | 1,500,000 | 2,800,000 | 2,700,000 | 4,400,000 |
Undistributed retained earnings relating to investments in all companies | 26,500,000 |  | 26,500,000 |  | 23,800,000
Minority investment in consolidated joint venture, included in other assets | 1,800,000 |  | 1,800,000 |  | 1,300,000
Number of entities in which investment is accounted under cost method | 2 |  | 2 |  |
Investments in unconsolidated privately-held entities, included in other assets | 392,000 |  | 392,000 |  | 392,000
Beijing JiYa Semiconductor Material Co., Ltd [Member] |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |
Investments, consolidated | 3,331,000 |  | 3,331,000 |  | 996,000
Percentage of ownership, consolidated method (in hundredths) | 46.00% |  | 46.00% |  |
Nanjing Jin Mei Gallium Co., Ltd [Member] |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |
Investments, consolidated | 592,000 |  | 592,000 |  | 592,000
Percentage of ownership, consolidated method (in hundredths) | 83.00% |  | 83.00% |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd [Member] |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |
Investments, consolidated | 410,000 |  | 410,000 |  | 410,000
Percentage of ownership, consolidated method (in hundredths) | 70.00% |  | 70.00% |  |
Donghai County Dongfang High Purity Electronic Materials Co., Ltd. [Member] |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |
Equity Method Investment by Parent | 2,100,000 |  | 2,100,000 |  | 2,167,000
Percentage of ownership, equity method (in hundredths) | 46.00% |  | 46.00% |  |
Xilingol Tongli Germanium Co. Ltd [Member] |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |
Equity Method Investment by Parent | 3,800,000 |  | 3,800,000 |  | 3,881,000
Percentage of ownership, equity method (in hundredths) | 25.00% |  | 25.00% |  |
Emeishan Jia Mei High Purity Metals Co., Ltd [Member] |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |
Equity Method Investment by Parent | $ 1,037,000 |  | $ 1,037,000 |  | $ 1,001,000
Percentage of ownership, equity method (in hundredths) | 25.00% |  | 25.00% |  |

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- Definition This element represents the aggregate carrying amount of all cost-method investments held by the Company. Generally, such investments do not have readily determinable fair values and are not required to be accounted for by the equity method. The carrying amount of such securities equates to cost, adjusted for other-than-temporary impairment. The cost method and lower-of-cost or market, an adaptation of the cost method, is generally followed for most investments in noncontrolled corporations, in some corporate joint ventures, and to a lesser extent in unconsolidated subsidiaries, particularly foreign. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph a -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 5 -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 -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 18 -Subparagraph a -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 22 -Subparagraph a -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 4 -Subparagraph c -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 4 -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
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