Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 188,088,000	$ 42,218,000
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of investment properties	(119,729,000)	(13,944,000)
Depreciation and amortization, including discontinued operations	152,546,000	96,192,000
Amortization of deferred financing costs and premium/discount on notes payable	(2,543,000)	1,063,000
Stock-based compensation expense, net of forfeitures	2,486,000	1,571,000
Effect of certain non-cash adjustments to rental revenues	(33,379,000)	(15,966,000)
Income from unconsolidated joint ventures	(43,362,000)	(5,144,000)
Operating distributions from unconsolidated joint ventures	40,207,000	5,893,000
Gain on extinguishment of debt	(2,258,000)	0
Changes in other operating assets and liabilities:
Change in other receivables and other assets, net	9,707,000	1,824,000
Change in operating liabilities	3,150,000	5,544,000
Net cash provided by operating activities	194,913,000	119,251,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from investment property sales	171,316,000	21,088,000
Property acquisition, development, and tenant asset expenditures	(229,811,000)	(122,357,000)
Purchase of tenant in common interest	(13,382,000)	0
Collection of notes receivable	5,161,000	0
Investment in unconsolidated joint ventures	(13,862,000)	(24,918,000)
Distributions from unconsolidated joint ventures	40,939,000	4,150,000
Change in notes receivable and other assets	(1,348,000)	(5,699,000)
Change in restricted cash	15,105,000	(3,667,000)
Net cash used in investing activities	(25,882,000)	(131,403,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from credit facility	589,300,000	182,800,000
Repayment of credit facility	(723,300,000)	(274,800,000)
Proceeds from issuance of notes payable	350,000,000	270,000,000
Repayment of notes payable	(493,774,000)	(7,239,000)
Payment of deferred financing costs	(2,048,000)	(1,604,000)
Shares withheld for payment of taxes on restricted stock vesting	(701,000)	0
Common stock issued, net of expenses	211,598,000	0
Contributions from noncontrolling interests	1,588,000	2,525,000
Distributions to nonredeemable noncontrolling interests	(1,364,000)	0
Repurchase of common stock	0	(13,743,000)
Common dividends paid	(73,950,000)	(50,549,000)
Other	100,000	0
Net cash provided by (used in) financing activities	(142,551,000)	107,390,000
NET INCREASE IN CASH AND CASH EQUIVALENTS	26,480,000	95,238,000
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	35,687,000	2,003,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD	62,167,000	97,241,000
Interest paid, net of amounts capitalized	26,927,000	20,792,000
Significant non-cash transactions:
Transfer from operating properties to real estate assets and other assets held for sale	0	203,735,000
Transfer from operating properties to liabilities of real estate assets held for sale	0	106,135,000
Transfer from investment in unconsolidated joint ventures to operating properties	68,390,000	0
Transfer from projects under development to operating properties	58,928,000	0
Common stock dividends declared	25,201,000	0
Transfer from investment in unconsolidated joint ventures to projects under development	0	5,880,000
Transfer from land held to projects under development	0	8,099,000
Change in accrued property acquisition, development, and tenant asset expenditures	$ (18,081,000)	$ (11,384,000)