Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Operating activities
Net income (loss)		$ 453,555	$ 337,610
Adjustments to reconcile net income to net cash provided from (used in) operating activities:
Depreciation and amortization		228,201	228,276
Other amortization expenses		4,171	3,361
Asset Impairment Charges		28,185	11,031
Stock-based compensation expense		11,557	4,906
Loss (gain) on derivatives and financial instruments, net		(7,173)	1,224
Loss (gain) on extinguishment of debt, net		11,707	31,356
Income from unconsolidated entities		2,429	23,106
Rental income in excess of cash received		(21,406)	(18,141)
Amortization related to above (below) market leases, net		718	8
Net loss (gain) on sales of properties		(338,184)	(244,092)
Distributions by unconsolidated entities		0	474
Increase (decrease) in accrued expenses and other liabilities		(10,707)	19,478
Decrease (increase) in receivables and other assets		5,591	(13,071)
Net cash provided from (used in) operating activities		368,644	385,526
Investing activities
Cash disbursed for acquisitions		(405,609)	(102,356)
Cash disbursed for capital improvements to existing properties		(46,547)	(42,115)
Cash disbursed for construction in progress		(22,735)	(69,334)
Capitalized interest		(2,336)	(4,129)
Investment in real estate loans receivable		(27,547)	(25,375)
Other investments, net of payments		(49,279)	48,311
Principal collected on real estate loans receivable		90,731	8,792
Contributions to unconsolidated entities		(14,366)	(13,073)
Distributions by unconsolidated entities		14,880	24,161
Proceeds from (payments on) derivatives investing		(8,324)	8,218
Decrease (increase) in restricted cash		0	0
Proceeds from sales of real property		892,209	1,087,074
Net cash provided from (used in) investing activities		421,077	920,174
Financing activities
Net increase (decrease) under unsecured lines of credit arrangements		146,000	(123,000)
Payments to extinguish senior unsecured notes		(450,000)	0
Net proceeds from the issuance of secured debt		20,326	12,536
Payments on secured debt		(197,655)	(822,438)
Net proceeds from the issuance of common stock		7,214	119,651
Redemption of preferred stock		0	(287,500)
Decrease (increase) in deferred loan costs		(14,341)	(36,674)
Contributions by noncontrolling interests	[1]	5,734	2,667
Distributions to noncontrolling interests	[1]	(12,564)	(20,014)
Acquisitions of noncontrolling interests		0	(38)
Cash distributions to stockholders		(335,508)	(329,794)
Other financing activities		(4,555)	(8,022)
Net cash provided from (used in) financing activities		(835,349)	(1,492,626)
Effect of foreign currency translation on cash, cash equivalents and restricted cash		444	2,843
Increase (decrease) in cash and cash equivalents		(45,184)	(184,083)
Cash, cash equivalents and restricted cash at the beginning of period		309,303	607,220
Cash, cash equivalents and restricted cash at the end of period		264,119	423,137
Supplemental cash flow information:
Interest paid		104,246	109,438
Income taxes paid (received), net		$ (721)	$ 3,349

[1] (1) Includes amounts attributable to redeemable noncontrolling interests.