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Leases - Components of Rental Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Fixed lease payments $ 99,255 $ 149,582 $ 335,799 $ 460,584
Variable lease payments 24,826 31,034 69,677 96,405
Total rental revenues $ 124,081 $ 180,616 $ 405,476 $ 556,989