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Stock Plans - Schedule of Stock Compensation Expense (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
Share-based Payment Arrangement [Abstract] |  |  |  |
Stock compensation expense | $ 4,044 | $ 1,904 | $ 10,130 | $ 9,595
Income tax benefit | 987 | 463 | 2,472 | 2,332
Stock compensation expense, net of income tax benefit | $ 3,057 | $ 1,441 | $ 7,658 | $ 7,263

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