Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 111,036	$ 148,075
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of real estate assets and leasing costs	186,242	181,875
Depreciation of non-real estate furniture, fixtures and equipment	3,179	3,862
Increase in provision for bad debts (Note 12)	6,714	2,743
Non-cash amortization of share-based compensation awards	18,901	13,617
Non-cash amortization of deferred financing costs and debt discounts and premiums	816	2,398
Non-cash amortization of net below market rents	(7,647)	(6,026)
Gain on sale of depreciable operating properties	0	(39,507)
Gain on sale of land	0	(449)
Non-cash amortization of deferred revenue related to tenant-funded tenant improvements	(13,680)	(12,394)
Straight-line rents	(16,293)	(25,537)
Net change in other operating assets	(9,163)	(16,970)
Net change in other operating liabilities	37,110	24,855
Net cash provided by operating activities	317,215	276,542
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for acquisition of undeveloped land (Note 2)	(311,299)	0
Expenditures for development properties and undeveloped land	(311,347)	(270,839)
Expenditures for acquisition of operating properties (Note 2)	(111,029)	0
Expenditures for operating properties	(107,825)	(61,875)
Net proceeds received from dispositions	0	182,492
Net decrease (increase) in acquisition-related deposits	21,000
Net decrease (increase) in acquisition-related deposits		(30,490)
Proceeds received from repayment of note receivable (Note 4)	15,100	0
Net cash used in investing activities	(805,400)	(180,712)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on unsecured revolving credit facility (Note 5)	645,000	70,000
Repayments on unsecured revolving credit facility (Note 5)	(285,000)	(10,000)
Borrowings on unsecured debt (Note 5)	120,000	0
Principal payments on secured debt	(2,670)	(5,740)
Proceeds from the issuance of unsecured debt (Note 5)	50,000	250,000
Repayments of unsecured debt	0	(189,000)
Financing costs	(2,278)	(7,480)
Net proceeds from issuance of common stock (Note 6)	130,744	308,812
Redemption of Series G and H Preferred stock	0	(200,000)
Repurchase of common stock and restricted stock units	(16,553)	(12,986)
Proceeds from exercise of stock options	41	12,051
Distributions to noncontrolling interests in consolidated property partnerships	(7,014)	(12,234)
Contributions from noncontrolling interests in consolidated property partnerships	8,273	250
Dividends and distributions paid to common stockholders and common unitholders	(132,639)	(297,993)
Dividends and distributions paid to preferred stockholders and preferred unitholders	0	(7,409)
Net cash provided by (used in) financing activities	507,904	(101,729)
Net increase (decrease) in cash and cash equivalents and restricted cash	19,719	(5,899)
Cash and cash equivalents and restricted cash, beginning of period	66,798	250,129
Cash and cash equivalents and restricted cash, end of period	$ 86,517	$ 244,230