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Financial Derivatives Narrative (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Derivative [Line Items] |  |
U.S. Treasury securities sold short, at fair value | $ 44,377 | $ 81,289
US Treasury Securities [Member] |  |
Derivative [Line Items] |  |
U.S. Treasury securities sold short, at fair value | 44,377 | 81,289
Investment Sold, Not yet Purchased, Balance, Principal Amount | $ 44,400 | $ 82,500

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- Definition Fair value of obligations arising from US treasury and other US government and agency debt obligations sold short. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35711043&loc=d3e42429-110968 + Details
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