CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 215,229	$ 277,926	$ 180,615
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of real estate assets and leasing costs	268,045	249,882	241,862
Depreciation of non-real estate furniture, fixtures and equipment	5,085	4,400	4,024
(Recoveries of) provision for bad debts (Notes 2 and 20)	(3,433)	5,685	3,269
Non-cash amortization of share-based compensation awards (Note 15)	27,007	27,932	19,046
Non-cash amortization of deferred financing costs and net debt discounts	1,427	1,084	3,247
Non-cash amortization of net below market rents (Note 5)	(9,206)	(9,748)	(8,528)
Gains on sales of depreciable operating properties (Note 4)	(36,802)	(142,926)	(39,507)
Non-cash amortization of deferred revenue related to tenant-funded tenant improvements (Note 10)	(19,190)	(18,429)	(16,767)
Straight-line rents	(72,023)	(26,976)	(33,275)
Amortization of the right of use ground lease asset (Note 2)	683
Loss on early extinguishment of debt (Note 9)	0	12,623	5,312
(Gain) loss on sale of land (Note 4)	0	(11,825)	(449)
Net change in other operating assets	(14,476)	(7,930)	(17,732)
Net change in other operating liabilities	24,175	48,345	5,895
Net cash provided by operating activities	386,521	410,043	347,012
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for development properties and undeveloped land	(845,464)	(489,236)	(397,440)
Expenditures for acquisitions of development properties and undeveloped land (Note 3)	(173,291)	(311,299)	(19,829)
Expenditures for acquisitions of operating properties (Note 3)	(186,258)	(257,340)	0
Expenditures for operating properties and other capital assets	(147,687)	(166,440)	(88,425)
Net proceeds received from dispositions (Note 4)	124,421	364,300	182,492
Decrease (increase) in acquisition-related deposits	0	36,000
Decrease (increase) in acquisition-related deposits			(35,900)
Proceeds received from repayment of note receivable	0	15,100	0
Net cash used in investing activities	(1,228,279)	(808,915)	(359,102)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of common stock (Note 13)	353,722	130,693	326,058
Redemption of Series G and H Preferred stock (Note 13)	0	0	(200,000)
Net proceeds from the issuance of unsecured debt (Note 9)	499,390	648,537	674,447
Repayments of unsecured debt (Note 9)	0	(261,823)	(519,024)
Borrowings on unsecured revolving credit facility	1,110,000	765,000	270,000
Repayments on unsecured revolving credit facility	(910,000)	(690,000)	(270,000)
Borrowings on unsecured debt (Note 9)	0	120,000	0
Principal payments and repayments of secured debt (Note 9)	(76,309)	(3,584)	(130,371)
Financing costs	(6,678)	(6,262)	(11,500)
Repurchase of common stock and restricted stock units (Note 15)	(14,556)	(16,553)	(12,986)
Proceeds from exercise of stock options	703	41	12,179
Contributions from noncontrolling interests in consolidated property partnerships (Note 11)	0	8,273	54,604
Distributions to noncontrolling interests in consolidated property partnerships	(12,952)	(11,803)	(16,542)
Dividends and distributions paid to common stockholders and common unitholders	(196,252)	(179,411)	(340,697)
Dividends and distributions paid to preferred stockholders and preferred unitholders	0	0	(7,409)
Net cash provided by (used in) financing activities	747,068	503,108	(171,241)
Net (decrease) increase in cash and cash equivalents and restricted cash	(94,690)	104,236	(183,331)
Cash and cash equivalents and restricted cash, beginning of year	171,034	66,798	250,129
Cash and cash equivalents and restricted cash, end of year	$ 76,344	$ 171,034	$ 66,798