Supplemental Cash Flow Information of the Company - Supplemental Cash Flow (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Jan. 01, 2019
SUPPLEMENTAL CASH FLOWS INFORMATION:
Cash paid for interest, net of capitalized interest of $20,403 and $18,901 as of March 31, 2020 and 2019, respectively	$ 10,035	$ 4,706
Capitalized interest	20,403	18,901
Cash paid for amounts included in the measurement of ground lease liabilities	1,332	1,220
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development properties	129,251	87,038
Tenant improvements funded directly by tenants	2,081	2,682
Initial measurement of operating right of use ground lease assets	96,145		$ 96,348	$ 82,938
Initial measurement of operating ground lease liabilities	98,247		$ 98,400	$ 87,409
NON-CASH FINANCING TRANSACTIONS:
Accrual of dividends and distributions payable to common stockholders and common unitholders (Notes 4 and 15)	57,620	47,676
Exchange of common units of the Operating Partnership into shares of the Company’s common stock	$ 81	$ 78