Stock-Based Compensation and Other Employee Benefits - Forth Additional Plans (Details) - USD ($) $ / shares in Units, $ in Thousands |
12 Months Ended | ||
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Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Share-based Payment Arrangement [Abstract] | |||
| Aggregate intrinsic value of options exercised | $ 19,762 | $ 7,154 | $ 5,588 |
| Cash received from stock option exercises | $ 8,995 | $ 6,742 | $ 6,696 |
| Weighted-average fair value of stock options granted (in usd per share) | $ 11.52 | $ 6.33 | $ 5.20 |
| Stock-based compensation expense | $ 1,933 | $ 1,620 | $ 1,258 |
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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