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Fair Value Measurement (Details Textual) | 12 Months Ended
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Dec. 31, 2012 Investment
Fair Value Measurement (Additional Textual) [Abstract] |
Number of Investment Broker | 3
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |
Fair Value Disclosures (Textual) [Abstract] |
Number of Assets held by entity under fair value | 0
Number of Liability held by entity under fair value | 0

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- Definition The number of derivative instruments of a particular derivative asset or group of derivative assets held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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