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Income Taxes (Reconciliation Of Effective Tax Rate) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Tax computed at statutory rate $ 320,138 $ 304,102 $ (60,037)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount (7,800) (307,101)  
State income taxes, net of federal tax benefit 56,936 21,343 (14,056)
Domestic production activities deduction 0 (9,937) 4,170
Noncontrolling interest in net income (20,215) (29,357) (26,903)
Goodwill 0 0 119,722
Other (1,816) 8,571 (3,485)
Income tax expense (benefit) total $ 347,243 $ (12,379) $ 19,411