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Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Leases [Abstract]        
Fixed contractual payments $ 529,514 $ 557,820 $ 1,116,471 $ 1,111,806
Variable lease payments 100,605 122,369 223,759 247,634
Lease $ 630,119 $ 680,189 $ 1,340,230 $ 1,359,440