Leases ASC 842 (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) propertyUnit
Lessor Disclosure [Abstract]
Rental and other revenues related to operating lease payments	$ 723,100
Variable lease payments	65,400
Operating leases, scheduled future minimum payments receivable [Abstract]
2020	647,558
2021	621,080
2022	596,698
2023	537,225
2024	474,258
Thereafter	2,213,294
Operating leases, total future minimum payments receivable due	$ 5,090,113
Lessee Disclosure [Abstract]
Number of properties subject to ground leases | propertyUnit	20
Weighted average remaining term of ground leases (in years)	52 years
Operating lease liability upon initial adoption	$ 35,300
Right of use asset upon initial adoption	$ 29,700
Operating lease discount rate (in hundredths)	4.50%
Operating ground lease expense	$ 2,500
Operating ground lease payments	2,200
Operating ground lease liabilities, scheduled future minimum payments [Abstract]
2020	2,086
2021	2,127
2022	2,169
2023	2,167
2024	2,123
Thereafter	83,697
Operating ground lease liability, total future minimum payments	94,369
Operating lease liability discount	(59,470)
Operating lease liability	$ 34,899
Minimum [Member]
Lessor Disclosure [Abstract]
Operating leases, term of leases	3 years
Maximum [Member]
Lessor Disclosure [Abstract]
Operating leases, term of leases	10 years