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Stock Repurchase (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 26, 2021
Equity [Abstract]        
Stock repurchased during period (in shares) 4,138,527 12,929,487 25,894,324  
Treasure stock acquired (in usd per share) $ 10.43 $ 8.91 $ 14.80  
Stock repurchased and retired $ 43,247,000 $ 115,477,000 $ 383,752,000  
Subsequent Event [Line Items]        
Share repurchase program, authorized amount $ 750,000,000      
Subsequent Event        
Subsequent Event [Line Items]        
Share repurchase program, authorized amount       $ 900,000,000
Amount available under the current stock repurchase program       $ 245,000,000