Supplemental Cash Flow Information of the Company (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
SUPPLEMENTAL CASH FLOWS INFORMATION:
Cash paid for interest, net of capitalized interest of $20,219 and $25,674 as of June 30, 2017 and 2016, respectively	$ 30,977	$ 25,787
Interest capitalized	20,219	25,674
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development properties	66,967	50,246
Tenant improvements funded directly by tenants	9,221	10,713
Assumption of accrued liabilities in connection with acquisitions	0	4,911
NON-CASH FINANCING TRANSACTIONS:
Accrual of dividends and distributions payable to common stockholders and common unitholders	43,305	36,093
Accrual of dividends and distributions payable to preferred stockholders and preferred unitholders	797	1,656
Exchange of common units of the Operating Partnership into shares of the Company’s common stock	10,939	39
Issuance of common units of the Operating Partnership in connection with an acquisition	0	48,033
Secured debt assumed by buyers in connection with land dispositions	$ 0	$ 2,322