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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Fair Value Disclosures [Abstract] |  |
Unrealized gain (loss) on available-for-sale marketable securities, net of taxes | $ 1,416 | $ (1,138)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Proceeds from available for sale municipal bonds | 3,539 | 2,467
Realized gain | 100 |
Realized loss |  | 100
Unrealized gains related to equity securities | 3,400 | 300
Municipal bonds — available-for-sale |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Proceeds from available for sale municipal bonds | $ 3,500 | $ 2,400

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- Definition Amount of unrealized gain before deducting unrealized loss on investments in equity securities classified as available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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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=82897076&loc=d3e27357-111563 + Details
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