CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 100,030	$ 123,995
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	31,527	27,561
Amortization of financing costs	1,192	1,546
Gain on disposition of properties	(81,965)	(88,984)
Impairment of asset	0	5,000
Stock compensation expense	4,150	3,746
Equity in earnings of unconsolidated affiliates	(3,694)	(9,999)
Gain on disposition of property of unconsolidated affiliates	0	(17,105)
Distributions of operating income from unconsolidated affiliates	2,974	10,035
Other, net	(3,812)	(2,645)
Changes in assets and liabilities
Cash in escrow	5,139	(11,505)
Rents receivable, net	(886)	(2,401)
Prepaid expenses and other assets	(4,546)	7,928
Accounts payable and accrued expenses	1,794	3,828
Other liabilities	(9,144)	2,751
Net cash provided by operating activities	42,759	53,751
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition of real estate	(18,537)	(273,071)
Deposits for properties under contract	(17,500)	0
Redevelopment and property improvement costs	(55,890)	(105,245)
Deferred leasing costs	(2,915)	(4,274)
Investments in and advances to unconsolidated affiliates	(63,034)	(6,505)
Return of capital from unconsolidated affiliates	35,608	5,660
Proceeds from disposition of property of unconsolidated affiliates	0	25,604
Change in control of previously consolidated investment	(2,578)	0
Proceeds from notes receivable	24,500	0
Issuance of notes receivable	(136,803)	(48,200)
Proceeds from sale of properties, net	150,379	197,882
Net cash used in investing activities	(86,770)	(208,149)
CASH FLOWS FROM FINANCING ACTIVITIES
Principal payments on mortgage and other notes	(275,620)	(78,351)
Principal payments on unsecured debt	(471,500)	(109,815)
Proceeds received from mortgage and other notes	22,371	83,161
Proceeds received from unsecured debt	608,515	185,600
Loan proceeds held as restricted cash	0	30,324
Deferred financing and other costs	(3,024)	(2,746)
Capital contributions from noncontrolling interests	157,409	30,134
Distributions to noncontrolling interests	(71,432)	(64,648)
Dividends paid to Common Shareholders	(52,980)	(53,270)
Proceeds from issuance of Common Shares, net of issuance costs of $3,383 and $522, respectively	141,349	21,080
Net cash provided by financing activities	55,088	41,469
Increase (decrease) in cash and cash equivalents	11,077	(112,929)
Cash and cash equivalents, beginning of period	72,776	217,580
Cash and cash equivalents, end of period	83,853	104,651
Supplemental disclosure of cash flow information
Cash paid during the period for interest, net of capitalized interest of $9,771 and $7,465, respectively	19,246	22,735
Cash paid for income taxes	(1,267)	1,573
Supplemental disclosure of non-cash investing activities
Acquisition of real estate through assumption of debt	1,463	90,765
Acquisition of capital lease obligation	76,461	0
Acquisition of real estate through issuance of OP Units	29,336	0
Acquisition of real estate through conversion of notes receivable	0	6,886
Acquisition of real estate through assumption of restricted cash	0	28,192
Disposition of air rights through issuance of notes receivable	0	(29,793)
Change in control of previously consolidated investment
Real estate, net	90,559	0
Investment in unconsolidated affiliates	(21,421)	0
Other assets and liabilities	3,997	0
Noncontrolling interest	(75,713)	0
Change in control of previously consolidated investment	$ (2,578)	$ 0