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Employee Stock Purchase and Equity-Based Compensation Plans - Schedule of Unvested Share Activity (Details) - Long-Term Growth Units
shares in Thousands
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Units, Unvested, Beginning balance | shares 127,437
Number of Units, Vested | shares (125,948)
Number of Units, Forfeited | shares (1,489)
Weighted Average Grant-Date Fair Value, Unvested, Beginning balance | $ / shares $ 20.23
Weighted Average Grant-Date Fair Value, Vested | $ / shares 22.67
Weighted Average Grant-Date Fair Value, Forfeited | $ / shares $ 22.67