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Leases - Components of Rental Revenue (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Leases [Abstract]        
Fixed lease payments $ 99,150,000 $ 151,730,000 $ 236,544,000 $ 311,002,000
Variable lease payments 21,072,000 33,663,000 44,851,000 65,371,000
Total rental revenues $ 120,222,000 $ 185,393,000 $ 281,395,000 $ 376,373,000