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Stock-Based Compensation - Summary of Activity for Restricted Stock Awards (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Number of Shares      
Shares granted     2,421,345
Weighted Average Grant Date Fair Value      
Shares granted, weighted average grant date fair value     $ 11.61
Restricted Stock      
Number of Shares      
Unvested at beginning of year 6,228,048 6,516,101 6,516,101
Shares granted 3,029,949 2,387,645 2,421,345
Vested (1,918,654)   (2,180,891)
Canceled (59,260)   (528,507)
Unvested at end of year 7,280,083   6,228,048
Weighted Average Grant Date Fair Value      
Unvested at beginning of year $ 12.43 $ 13.31 $ 13.31
Shares granted, weighted average grant date fair value 11.15 $ 11.64 11.61
Vested 13.21   14.06
Canceled 11.65   12.88
Unvested at end of year $ 11.70   $ 12.43