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Shareholders' Equity-Common Stock Rollforward (Details) - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Preferred Stock, Shares Authorized 2,000,000    
Stock Repurchase Program, Authorized Amount $ 1,600,000    
Stock Repurchase Program, Dollar Value of Shares Repurchased 1,136,543    
Stock Repurchase Program, Remaining Authorized Repurchase Amount 463,457    
Shares Approved December 2016 Member [Member]      
Stock Repurchase Program, Authorized Amount 400,000    
Stock Repurchase Program, Dollar Value of Shares Repurchased 400,000    
Stock Repurchase Program, Remaining Authorized Repurchase Amount 0    
Shares Approved December 2018 Member [Member]      
Stock Repurchase Program, Authorized Amount 600,000    
Stock Repurchase Program, Dollar Value of Shares Repurchased 600,000    
Stock Repurchase Program, Remaining Authorized Repurchase Amount 0    
Shares Approved July 2020 Member [Member]      
Stock Repurchase Program, Authorized Amount 600,000    
Stock Repurchase Program, Dollar Value of Shares Repurchased 136,543    
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 463,457    
Common Stock Issued [Member]      
Common stock outstanding, Beginning balance 125,424 125,424 125,424
Shares issued for stock-based compensation awards 0 0 0
Repurchases of common stock 0 0 0
Common stock outstanding, Ending balance 125,424 125,424 125,424
Treasury Stock      
Common stock outstanding, Beginning balance 44,804 40,233 37,733
Shares issued for stock-based compensation awards 764 886 709
Repurchases of common stock (6,541) (5,457) (3,209)
Common stock outstanding, Ending balance 50,581 44,804 40,233
Common Stock at Par Value      
Common stock outstanding, Beginning balance 80,620 85,191 87,691
Shares issued for stock-based compensation awards 764 886 709
Repurchases of common stock (6,541) (5,457) (3,209)
Common stock outstanding, Ending balance 74,843 80,620 85,191