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Financial Instruments (Details Textual) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 Forward Exchange Contracts, Australian [Member] USD ($) | Sep. 30, 2014 Forward Exchange Contracts, Australian [Member] AUD | Sep. 30, 2014 Forward Exchange Contracts, Canadian [Member] USD ($) | Sep. 30, 2014 Forward Exchange Contracts, Canadian [Member] CAD
Foreign Exchange Contracts At Current Value [Line Items] |  |  |  |
Investment Owned, Foreign Currency Contract, Current Value | $ 4,400,000 | 4,900,000 | $ 11,800,000 | 13,000,000
Foreign Currency Transaction Gain (Loss), Realized | $ 200,000 |  |  |

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- Definition Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
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