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Leases (Schedule Of Supplemental Cash Flow Related To Leases) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]        
Cash paid for operating lease liabilities $ 89,134 $ 66,595 $ 177,942 $ 144,484
Operating lease assets obtained in exchange for operating lease liabilities 150,561 102,113 294,663 239,079
Derecognition of operating lease assets due to terminations or impairment $ 432 $ 12,410 $ 1,979 $ 14,417