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Share-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total pre-tax stock-based compensation expense charged against income | $ 3,925 | $ 3,659
Stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total pre-tax stock-based compensation expense charged against income | 1,054 | 1,326
Restricted stock and restricted stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total pre-tax stock-based compensation expense charged against income | 2,598 | 1,998
Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total pre-tax stock-based compensation expense charged against income | $ 273 | $ 335

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