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Employee Benefits and Share-Based Compensation - Summary of Performance-Based Restricted Stock Activity (Details) - Performance-Based Restricted Stock - 2009 Plan - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Shares      
Outstanding (in shares) 134    
Granted (Awarded) (in shares) 99    
Vested (Released) (in shares) (73)    
Forfeited (in shares) (5)    
Outstanding (in shares) 155 134  
Weighted-Average Grant Date Fair Value      
Outstanding (in dollars per share) $ 55.82    
Granted (Awarded) (in dollars per share) 82.17 $ 73.38 $ 38.03
Vested (Released) (in dollars per share) 50.54    
Forfeited (in dollars per share) 81.72    
Outstanding (in dollars per share) $ 74.26 $ 55.82