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Fair Value of Financial Instruments (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Fair Value of Financial Instruments (Textual) [Abstract] |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative Total | $ (5,076,000) | $ 2,529,000 | $ (1,157,000)
Percentage Of Investment Portfolio Fair Value Pricing Services Or Index Price | 90.00% | 90.00% |
Level 3 [Member] |  |  |
Fair Value of Financial Instruments (Textual) [Abstract] |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative Total | $ (5,011,000) | $ 2,528 |

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- Definition Fair value of financial instruments. + References No definition available. + Details
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- Definition Percentage of investment portfolio fair value pricing services or index price. + References No definition available. + Details
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- Definition Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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