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Equity Incentive Plans - Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |
Stock option plan expense | $ 1,141 | $ 1,085 | $ 996
Restricted stock expense | $ 22,755 | $ 21,260 | $ 21,053

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