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Leases - Components of Rental Revenue (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Leases [Abstract]    
Fixed lease payments $ 137,394,000 $ 159,278,000
Variable lease payments 23,779,000 31,702,000
Total rental revenues $ 161,173,000 $ 190,980,000