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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Fair Value Disclosures [Abstract] |  |  |  |  |  |
Unrealized gain (loss) on available-for-sale marketable securities, net of taxes | $ 791 | $ 1,416 | $ 97 | $ (1,138) | $ 2,207 | $ (1,041)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Proceeds from available for sale municipal bonds |  |  |  |  | 7,145 | 5,775
Unrealized gains related to equity securities | 1,600 |  | 1,000 |  | 5,000 |
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 | 3,600 |  | 3,300 |  | 7,100 | 5,800
Realized gain | $ 100 |  |  |  | $ 100 |
Realized loss |  |  | $ (100) |  |  | $ (200)

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