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Stock-Based Compensation - Summary of PSUs and RSUs to be Settled in Common Stock Activity (Details) - $ / shares
shares in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Restricted Stock and RSUs to be Settled in Common Stock    
Shares    
Unvested, shares, beginning of period (in shares) 3,869 3,265
Shares granted (in shares) 929 1,890
Vested, shares (in shares) (1,375) (1,168)
Forfeited, shares (in shares) (85) (79)
Unvested, shares, end of period (in shares) 3,338 3,908
Weighted Average Grant Date Fair Value    
Unvested, weighted average grant date fair value, beginning of period (in usd per share) $ 37.57 $ 35.34
Weighted average grant date fair value (in dollars per share) 82.57 39.03
Vested, weighted average grant date fair value (in usd per share) 36.85 35.79
Forfeited, weighted average grant date fair value (in usd per share) 44.60 36.02
Unvested, weighted average grant date fair value, end of period (in usd per share) $ 50.26 $ 36.98
Performance Stock Units    
Shares    
Unvested, shares, beginning of period (in shares) 1,047 848
Shares granted (in shares) 174 436
Vested, shares (in shares) (268) (238)
Forfeited, shares (in shares) (11) 0
Unvested, shares, end of period (in shares) 942 1,046
Weighted Average Grant Date Fair Value    
Unvested, weighted average grant date fair value, beginning of period (in usd per share) $ 37.65 $ 33.20
Weighted average grant date fair value (in dollars per share) 90.44 34.56
Vested, weighted average grant date fair value (in usd per share) 38.28 17.48
Forfeited, weighted average grant date fair value (in usd per share) 36.90  
Unvested, weighted average grant date fair value, end of period (in usd per share) $ 47.27 $ 37.34