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Investments - Narrative (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($) investment | Mar. 31, 2017 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |
Investment impairment charges | $ | $ 253 | $ 52
Number of securities in gross unrealized loss position | investment | 28 |
Number of securities in gross unrealized loss position for longer than 12 months | investment | 3 |
Total unrealized loss | $ | $ 28 |

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- Definition Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer + References No definition available. + Details
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- Definition Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions + References No definition available. + Details
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- Definition Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions + References No definition available. + Details
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- References No definition available. + Details
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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -URI http://asc.fasb.org/extlink&oid=82897076&loc=SL6284393-111563 + Details
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