Leases - Summary of Quantitative Disclosures for Lessees (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lease cost:
Interest on lease liabilities (capitalized)	$ 1,029	$ 225
Total lease cost	31,489	31,549
Cash paid for amounts included in the measurement of lease liabilities:
Investing cash flows from finance leases (capitalized)	$ 567	34,922
ROU assets obtained in exchange for new finance lease liabilities		$ 23,201
Weighted-average remaining lease term – finance leases	18 years 8 months 12 days	19 years 8 months 12 days
Weighted-average discount rate – finance leases	3.00%	3.00%
Corporate Office Leases [Member]
Lease cost:
Operating lease cost	$ 3,747	$ 3,937
Variable lease cost	1,307	1,489
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from Operating leases	$ 5,296	5,494
ROU assets obtained in exchange for new operating lease liabilities		$ 44,298
Weighted-average remaining lease term – operating leases	17 years 4 months 24 days	18 years 1 month 6 days
Weighted-average discount rate – operating leases	3.20%	3.20%
Ground Leases [Member]
Lease cost:
Operating lease cost	$ 22,102	$ 22,198
Variable lease cost	3,304	3,700
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from Operating leases	$ 16,552	16,837
ROU assets obtained in exchange for new operating lease liabilities		$ 422,018
Weighted-average remaining lease term – operating leases	55 years 3 months 18 days	56 years 2 months 12 days
Weighted-average discount rate – operating leases	5.00%	5.00%