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Leases ASC 842 (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
propertyUnit
Lessor Disclosure [Abstract]    
Rental and other revenues related to operating lease payments $ 180,700 $ 350,100
Variable lease income 16,400 31,900
Operating leases, scheduled future minimum payments receivable [Abstract]    
July 1 to December 31, 2019 312,569 312,569
2020 603,436 603,436
2021 556,132 556,132
2022 520,992 520,992
2023 461,440 461,440
2024 401,060 401,060
Thereafter 1,751,410 1,751,410
Operating leases, total future minimum payments receivable due $ 4,607,039 $ 4,607,039
Lessee Disclosure [Abstract]    
Number of properties subject to ground leases | propertyUnit   20
Weighted average remaining term of ground leases (in years) 52 years 52 years
Operating lease liability upon initial adoption $ 35,300 $ 35,300
Right of use asset upon initial adoption $ 29,700 $ 29,700
Operating lease discount rate (in hundredths) 4.50% 4.50%
Operating ground lease expense $ 600 $ 1,200
Operating ground lease payments 700 1,200
Operating ground lease liabilities, scheduled future minimum payments [Abstract]    
July 1 to December 31, 2019 1,030 1,030
2020 2,086 2,086
2021 2,127 2,127
2022 2,169 2,169
2023 2,167 2,167
2024 2,123 2,123
Thereafter 83,697 83,697
Operating ground lease liability, total future minimum payments 95,399 95,399
Operating lease liability discount (60,269) (60,269)
Operating lease liability $ 35,130 $ 35,130
Minimum [Member]    
Lessor Disclosure [Abstract]    
Operating leases, term of leases 3 years 3 years
Maximum [Member]    
Lessor Disclosure [Abstract]    
Operating leases, term of leases 10 years 10 years