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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 payments $ 122,976 $ 129,030 $ 375,882 $ 380,647
Variable payments 16,933 21,195 50,139 54,066
Total rental revenue $ 139,909 $ 150,225 $ 426,021 $ 434,713