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Stock Repurchases Tender Offer (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items]      
Repurchase of common stock (in shares) 16,477 41,020 16,844
Value of treasury stock acquired $ 1,446,767 $ 2,402,475 $ 1,153,511
Treasury stock acquired, average cost per share $ 87.80 $ 58.57 $ 68.48
Open Market Purchases      
Equity, Class of Treasury Stock [Line Items]      
Repurchase of common stock (in shares) 8,495 19,218 16,844
Value of treasury stock acquired $ 741,850 $ 1,168,321 $ 1,153,511
Treasury stock acquired, average cost per share $ 87.32 $ 60.79 $ 68.48
Tender Offer      
Equity, Class of Treasury Stock [Line Items]      
Repurchase of common stock (in shares) 7,982 21,802
Value of treasury stock acquired $ 704,917 $ 1,234,154
Treasury stock acquired, average cost per share $ 88.32 $ 56.61
Treasury Stock, Shares Repurchases, Table Footnotes:      
Treasury Stock Acquired, Average Cost Per Share, Clearing Price $ 88.00 $ 56.50  
Share Repurchase Fees And Expenses $ 2,529 $ 2,343