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Changes in Equity (Rollforward) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Balances $ 3,921,241 $ 3,775,989
Dividends declared (52,585) (53,504)
Noncontrolling investors of USS (7,504)  
Share repurchases (106,529) (84,308)
Equity-based compensation 9,429 6,695
Net income 190,836 204,827
Other comprehensive loss, net of tax 37 (171)
Balances 3,954,925 3,849,528
Common Stock    
Balances 646 645
Balances 646 645
Treasury Stock    
Balances (1,525,113) (1,184,243)
Share repurchases (106,529) (84,308)
Equity-based compensation 6,834 6,714
Balances (1,624,808) (1,261,837)
Additional Paid-In Capital    
Balances 1,181,012 1,160,048
Equity-based compensation 2,764 91
Balances 1,183,776 1,160,139
Retained Earnings    
Balances 4,419,296 3,958,320
Dividends declared (52,585) (53,504)
Equity-based compensation (169) (110)
Net income 187,340 204,328
Balances 4,553,882 4,109,034
AOCI Attributable to Parent [Member]    
Balances (7) 301
Other comprehensive loss, net of tax 37 (171)
Balances 30 130
Noncontrolling Interests    
Balances (154,593) (159,082)
Noncontrolling investors of USS (7,504)  
Net income 3,496 499
Balances (158,601) (158,583)
Redeemable Noncontrolling Interest    
Balances 143,614 111,240
Noncontrolling investors of USS   28,690
Noncontrolling investors of USS 7,400  
Balances $ 151,014 $ 139,930