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Leases - Components of Rental Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Fixed lease payments $ 151,730 $ 311,002
Variable lease payments 33,663 65,371
Total rental revenues $ 185,393 $ 376,373