Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 72,726	$ 72,587
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of real estate assets and leasing costs	124,633	120,734
Depreciation of non-real estate furniture, fixtures and equipment	2,088	2,436
Increase in provision for bad debts (Note 12)	5,376	1,707
Non-cash amortization of share-based compensation awards	12,267	8,966
Non-cash amortization of deferred financing costs and debt discounts and premiums	582	1,469
Non-cash amortization of net below market rents	(5,481)	(3,603)
Gain on sale of depreciable operating properties	0	(2,257)
Non-cash amortization of deferred revenue related to tenant-funded tenant improvements	(8,869)	(8,243)
Straight-line rents	(10,566)	(15,537)
Net change in other operating assets	(5,513)	(7,418)
Net change in other operating liabilities	1,600	7,575
Net cash provided by operating activities	188,843	178,416
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for acquisition of undeveloped land (Note 2)	(311,299)	0
Expenditures for development properties and undeveloped land	(204,039)	(161,045)
Expenditures for acquisition of operating properties (Note 2)	(111,029)	0
Expenditures for operating properties	(74,079)	(40,738)
Net proceeds received from dispositions	0	11,865
Net decrease (increase) in acquisition-related deposits	21,000
Net decrease (increase) in acquisition-related deposits		(26,100)
Proceeds received from repayment of note receivable (Note 4)	15,100	0
Net cash used in investing activities	(664,346)	(216,018)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on unsecured revolving credit facility (Note 5)	505,000	0
Repayments on unsecured revolving credit facility (Note 5)	(180,000)	0
Borrowings on unsecured debt (Note 5)	120,000	0
Principal payments on secured debt	(1,768)	(4,213)
Proceeds from the issuance of unsecured debt	0	250,000
Financing costs	(1,840)	(2,191)
Net proceeds from issuance of common stock	124,147	308,832
Redemption of Series G Preferred stock	0	(100,000)
Repurchase of common stock and restricted stock units	(13,642)	(11,642)
Proceeds from exercise of stock options	41	12,051
Distributions to noncontrolling interests in consolidated property partnerships	(6,485)	(8,651)
Contributions from noncontrolling interests in consolidated property partnerships	0	250
Dividends and distributions paid to common stockholders and common unitholders	(85,931)	(255,292)
Dividends and distributions paid to preferred stockholders and preferred unitholders	0	(5,806)
Net cash provided by financing activities	459,522	183,338
Net (decrease) increase in cash and cash equivalents and restricted cash	(15,981)	145,736
Cash and cash equivalents and restricted cash, beginning of period	66,798	250,129
Cash and cash equivalents and restricted cash, end of period	$ 50,817	$ 395,865