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Debt (Details Textual) | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  |
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Mar. 31, 2012 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2012 Other current assets [Member] USD ($) | Dec. 31, 2012 Other long term assets [Member] USD ($) | Dec. 31, 2012 Term Loan [Member] | Dec. 21, 2011 Term Loan [Member] USD ($) | Dec. 20, 2011 Term Loan [Member] USD ($) | Dec. 31, 2012 Revolving Credit Facility [Member] USD ($) | Dec. 20, 2011 Revolving Credit Facility [Member] USD ($) | Dec. 31, 2012 Chinese Credit Facility [Member] USD ($) | Dec. 31, 2011 Chinese Credit Facility [Member] USD ($) | Dec. 31, 2012 Chinese Credit Facility BOA [Member] USD ($) | Dec. 31, 2012 Chinese Credit Facility BOA [Member] CNY | Dec. 31, 2012 Chinese Credit Facility JPM [Member] USD ($) | Apr. 30, 2012 Chinese Credit Facility JPM [Member] USD ($) | Apr. 30, 2012 Chinese Credit Facility JPM [Member] CNY | Dec. 31, 2012 Letter of Credit [Member] USD ($) | Dec. 31, 2012 Borrowings on same-day notice [Member] USD ($)
Debt (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing limits |  |  |  |  |  |  |  | $ 600,000,000 |  |  |  |  | $ 30,000,000 |  | 189,000,000 |  |  |  |  |
Term loan facility principal amount |  | 380,000,000 |  |  |  |  |  | 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Period of term loan facility |  |  |  |  |  |  |  | 5 years |  | 5 years |  |  |  |  |  |  |  |  |  |
Borrowings, maturity date |  |  |  |  |  | Dec. 01, 2016 |  |  | Dec. 01, 2016 |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity under revolving credit facility |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  | 40,000,000 | 40,000,000
Borrowings, interest rate basis |  |  |  |  |  | 2.00% |  |  |  |  |  |  | 5.60% |  | 5.60% | 5.60% |  |  |  |
Borrowings alternate base rate |  | 0.75% |  |  |  | 1.75% |  |  |  |  |  |  | 100.00% |  | 100.00% | 100.00% |  |  |  |
Revolving Credit Facility borrowings |  | 32,145,000 | 26,734,000 |  |  |  |  |  | 0 |  |  |  | 21,800,000 |  |  | 10,300,000 |  |  |  |
Deferred financing costs |  |  |  | 800,000 | 1,800,000 |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Short term borrowings outstanding |  |  |  |  |  |  |  |  |  |  | 32,100,000 | 16,700,000 |  |  |  |  |  |  |  |
Extended revolving credit facility of Chinese subsidiaries with BOA |  |  |  |  |  |  |  |  |  |  |  |  | 22,000,000 | [1] | 138,600,000 |  | 20,000,000 | 125,000,000 |  |
Interest rate of Chinese Credit Facility BOA |  | Chinese Credit Facility—BOA currently bears interest based at 100% of the People’s Bank of China’s base rate and was 5.6% as of December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  | Chinese Credit Facility—JPM currently bears interest based at 100% of the People’s Bank of China’s base rate and was 5.6% as of December 31, 2012 |  |  |  |
Debt (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate description |  | interest at LIBOR plus 175 basis points, or the Eurocurrency Spread, or the alternate base rate (“ABR”) plus 75 basis points |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee on undrawn amount |  | 0.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan principal repayment |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan first installment |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal repayment of term loan |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit facility payments | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest and commitments fees |  | 8,700,000 | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amortization expense |  | $ 889,000 | $ 21,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Includes stock-based compensation as follows:

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- Definition The increased or maximum borrowing capacity under our Chinese credit facilities. + References No definition available. + Details
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- Definition Percentage of repayment amount on total principal amount of term loan after first year. + References No definition available. + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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