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Share-Based Compensation - Vesting Activity of Restricted Stock Unit Awards (Details) - Restricted Stock Unit Awards - USD ($)
shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock awards vested (in shares) 238 183
Fair value of awards vested $ 2,670 $ 719