Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flow from operating activities:
Net income		$ 498,463	$ 439,671	$ 386,138
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		310,380	360,811	355,320
Impairment charges	[1],[2]	79,207	67,331	93,266
Deferred taxes			807	55,068
Early extinguishment of debt charges		12,762	1,753	45,674
Equity award expense		18,221	21,563	19,071
Gain on sale of operating properties, net		(229,840)	(93,538)	(92,823)
Gain on change in control of joint venture interests			(71,160)	(57,386)
Equity in income of joint ventures, net		(71,617)	(60,763)	(218,714)
Equity in income from other real estate investments, net		(29,100)	(67,001)	(27,773)
Distributions from joint ventures and other real estate investments		104,626	58,189	90,589
Change in accounts and notes receivable		5,229	(7,934)	(6,571)
Change in accounts payable and accrued expenses		(9,175)	4,417	(7,886)
Change in Canadian withholding tax receivable			12,996	23,571
Change in other operating assets and liabilities		(51,220)	(52,961)	(65,448)
Net cash flow provided by operating activities		637,936	614,181	592,096
Cash flow from investing activities:
Acquisition of operating real estate and other related net assets		(5,407)	(153,854)	(203,190)
Improvements to operating real estate		(290,874)	(206,800)	(143,489)
Acquisition of real estate under development		(4,592)	(10,010)	(51,588)
Improvements to real estate under development		(235,988)	(160,257)	(72,759)
Investment in marketable securities		(63)	(9,822)	(2,466)
Proceeds from sale of marketable securities		957	3,146	1,937
Investments in and advances to real estate joint ventures		(36,139)	(35,291)	(86,453)
Reimbursements of investments and advances to real estate joint ventures		21,127	55,839	71,656
Distributions from liquidation of real estate joint ventures				138,475
Return of investment from liquidation of real estate joint ventures				191,902
Investment in other real estate investments		(524)	(666)	(233)
Reimbursements of investments and advances to other real estate investments		12,878	40,709	11,019
Investment in other financing receivable		(125)
Collection of mortgage loans receivable		22,299	1,405	921
Investment in other investments		(857)
Reimbursements of other investments				500
Proceeds from sale of operating properties		754,731	181,321	304,600
Proceeds from sale of development properties				4,551
Proceeds from insurance casualty claims		16,222
Net cash flow provided by/(used for) investing activities		253,645	(294,280)	165,383
Cash flow from financing activities:
Principal payments on debt, excluding normal amortization of rental property debt		(204,746)	(687,117)	(700,853)
Principal payments on rental property debt		(13,113)	(15,186)	(19,039)
Proceeds from mortgage and construction loan financings		50,972	206,000
Proceeds/(repayments) under the unsecured revolving credit facility, net		92,254	(17,143)	26,445
Proceeds from issuance of unsecured notes			1,250,000	1,400,000
Repayments under unsecured notes/term loan		(315,095)	(550,000)	(1,261,850)
Payment of early extinguishment of debt charges		(13,308)	(2,631)	(45,674)
Change in other financing liablities		(4,528)	911	1,367
Contributions from noncontrolling interests		109	1,422
Redemption/distribution of noncontrolling interests		(6,660)	(96,599)	(12,594)
Dividends paid		(529,756)	(506,172)	(474,045)
Proceeds from issuance of stock, net		33,705	440,946	307,395
Redemption of preferred stock			(225,000)
Repurchase of common stock		(75,126)
Financing origination costs		(1,221)	(23,305)	(25,679)
Net cash flow used for financing activities		(986,513)	(223,874)	(804,527)
Net change in cash and cash equivalents		(94,932)	96,027	(47,048)
Cash and cash equivalents, beginning of year		238,513	142,486	189,534
Cash and cash equivalents, end of year		143,581	238,513	142,486
Interest paid during the year including payment of early extinguishment of debt charges of $13,308, $2,631 and $45,674, respectively (net of capitalized interest of $17,549, $14,480 and $5,618, respectively)		199,701	192,155	252,482
Income taxes paid/(received) during the year (net of refunds received of $1,007, $16,118 and $113,934, respectively)		$ 514	$ (14,456)	$ 6,090

[1] During 2016, the Company recognized aggregate impairment charges of $93.3 million, before an income tax benefit of $21.1 million and noncontrolling interests of $0.4 million, primarily related to sale of certain operating properties and certain properties maintained in the Company's TRS for which the hold period was re-evaluated in connection with the Merger (see Footnote 21 of the Notes to Consolidated Financial Statements for additional disclosure) and adjustments to property carrying values in connection with the Company's efforts to market certain properties and management's assessment as to the likelihood and timing of such potential transactions and the anticipated hold period for such properties.

[2] See Footnote 15 of the Notes to Consolidated Financial Statements for additional disclosure on fair value