Leases - Summary of Quantitative Disclosures for Lessees (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Lease cost:
Interest on lease liabilities (capitalized)	$ 55	$ 55
Total lease cost	$ 7,837	23,331
Cash paid for amounts included in the measurement of lease liabilities:
Investing cash flows from finance leases (capitalized)		47
ROU assets obtained in exchange for new finance lease liabilities		$ 23,201
Weighted-average remaining lease term – finance leases	19 years 10 months 24 days	19 years 10 months 24 days
Weighted-average discount rate – finance leases	3.00%	3.00%
Corporate Office Leases [Member]
Lease cost:
Operating lease cost	$ 935	$ 2,753
Short-term lease cost	56	168
Variable lease cost	$ 361	1,130
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from Operating leases		4,128
ROU assets obtained in exchange for new operating lease liabilities		$ 45,791
Weighted-average remaining lease term – operating leases	19 years 2 months 12 days	19 years 2 months 12 days
Weighted-average discount rate – operating leases	3.20%	3.20%
Ground Leases [Member]
Lease cost:
Operating lease cost	$ 5,550	$ 16,650
Variable lease cost	$ 880	2,575
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from Operating leases		12,035
ROU assets obtained in exchange for new operating lease liabilities		$ 422,018
Weighted-average remaining lease term – operating leases	56 years 4 months 24 days	56 years 4 months 24 days
Weighted-average discount rate – operating leases	5.00%	5.00%