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Leases - Components of leasing revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Leases [Abstract]        
Leasing revenue—fixed payments $ 150,292 $ 160,784 $ 306,339 $ 326,671
Leasing revenue—variable payments 46,239 52,245 101,826 99,192
Provision for doubtful accounts (27,777) (2,007) (28,690) (3,833)
Total leasing revenue $ 168,754 $ 211,022 $ 379,475 $ 422,030