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Leases (Schedule Of Lease Expense Components) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Operating lease cost $ 77,483 $ 228,989
Short-term lease cost 737 2,211
Variable lease cost 9,429 27,809
Sublease income (886) (2,561)
Total lease cost $ 86,763 $ 256,448