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Fair Value Measurements - Reconciliation of Level Three Investments (Details) - Level 3 - Investments - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of period | $ 5,532 | $ 0 | $ 4,439 | $ 0
Acquired in period | 0 | 2,916 | 1,326 | 2,916
Change in unrealized gain (loss), net | 212 | 7 | (21) | 7
Balance at end of period | $ 5,744 | $ 2,923 | $ 5,744 | $ 2,923

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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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