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Investments - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Investments |  |  |  |
Sales proceeds |  | $ 19,591 | $ 9,491 | $ 21,125
Realized gains |  | 49 | 2 | 84
Realized losses |  | (64) | (148) | (64)
Net realized gains |  | $ (15) | $ (146) | $ 20

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563 + Details
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