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Investments - Schedule of Unrealized Net Gains (Losses) Recognized in NI on Equity Securities Still Held at Period-End (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2018
Realized Investment Gains Losses [Abstract] |  |
Net gains (losses) recognized on equity securities | $ 539 | $ (1,406)
Less: Net gains (losses) recognized on equity securities sold | (49) | (49)
Net gains (losses) recognized in net income on equity securities still held as of period-end | $ 588 | $ (1,357)

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- Definition Net gains (losses) recognized in net income during period on equity securities. + References No definition available. + Details
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- Definition Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714 + Details
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- Definition Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714 + Details
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