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Investments in Marketable Securities Available-for sale (Tables) | 12 Months Ended
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Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract] |
Available-for-sale Securities [Table Text Block] | Following is a summary of marketable securities as of December 31, 2011 and 2012:
|  | December 31, 2011 |
|  | Aggregate |  |  | Gross Unrealized |  |  | Gross Unrealized |  |  | Aggregate Market |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (in thousands) |
Time deposit with original maturities more than three months |  | $ | 150 |  |  |  | 15 |  |  |  | - |  |  |  | 165 |
|  | December 31, 2012 |
|  | Aggregate |  |  | Gross Unrealized |  |  | Gross Unrealized |  |  | Aggregate Market |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  | (in thousands) |
Time deposit with original maturities more than three months |  | $ | 150 |  |  |  | 22 |  |  |  | - |  |  |  | 172 |
Schedule Of Information On Sales Of Available For Sale Marketable Securities [Table Text Block] | Information on sales of available for sale marketable securities for the years ended December 31, 2010, 2011 and 2012 is summarized below.
Period |  | Proceeds from sales |  |  | Gross realized gains |  |  | Gross realized losses |
|  | (in thousands) |
Year 2010 |  | $ | 33,443 |  |  |  | 326 |  |  |  | (30 | )
Year 2011 |  | $ | 25,834 |  |  |  | 420 |  |  |  | (70 | )
Year 2012 |  | $ | 19,612 |  |  |  | 35 |  |  |  | (32 | )

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- Definition Tabular disclosure of Information on sales of available for sale marketable securities. + References No definition available. + Details
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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a, b -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 Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a, b -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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19, 20, 21 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
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