Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Operating activities
Net income (loss)		$ 337,610	$ 165,474
Adjustments to reconcile net income to net cash provided from (used in) operating activities:
Depreciation and amortization		228,276	228,696
Other amortization expenses		3,361	1,118
Asset Impairment Charges		11,031	14,314
Stock-based compensation expense		4,906	8,186
Loss (gain) on derivatives, net		1,224	0
Loss (gain) on extinguishment of debt, net		31,356	(24)
Income from unconsolidated entities		23,106	3,820
Rental income in excess of cash received		(18,141)	(29,669)
Amortization related to above (below) market leases, net		8	230
Net loss (gain) on sales of properties		(244,092)	0
Distributions by unconsolidated entities		474	174
Increase (decrease) in accrued expenses and other liabilities		19,478	(13,526)
Decrease (increase) in receivables and other assets		(13,071)	1,816
Net cash provided from (used in) operating activities		385,526	380,609
Investing activities
Cash disbursed for acquisitions		(102,356)	(171,482)
Cash disbursed for capital improvements to existing properties		(42,115)	(35,025)
Cash disbursed for construction in progress		(69,334)	(66,739)
Capitalized interest		(4,129)	(3,037)
Investment in real estate loans receivable		(25,375)	(27,251)
Other investments, net of payments		48,311	(30,773)
Principal collected on real estate loans receivable		8,792	93,774
Contributions to unconsolidated entities		(13,073)	(12,784)
Distributions by unconsolidated entities		24,161	11,747
Proceeds from (payments on) derivatives investing		8,218	0
Decrease (increase) in restricted cash		145,065	(394)
Proceeds from sales of real property		1,087,074	0
Net cash provided from (used in) investing activities		1,065,239	(241,964)
Financing activities
Net increase (decrease) under unsecured lines of credit arrangements		(123,000)	(190,000)
Proceeds from issuance of senior unsecured notes		0	688,560
Payments to extinguish senior unsecured notes		0	(400,000)
Secured debt issued		12,536	75,136
Payments on secured debt		(822,438)	(130,343)
Net proceeds from the issuance of common stock		119,651	93,433
Redemption of preferred stock		(287,500)	0
Decrease (increase) in deferred loan costs		(36,674)	(1,217)
Contributions by noncontrolling interests	[1]	2,667	126,142
Distributions to noncontrolling interests	[1]	(20,014)	(76,222)
Acquisitions of noncontrolling interests		(38)	0
Cash distributions to stockholders		(329,794)	(322,122)
Other financing activities		(8,022)	(7,294)
Net cash provided from (used in) financing activities		(1,492,626)	(143,927)
Effect of foreign currency translation on cash and cash equivalents		2,843	323
Increase (decrease) in cash and cash equivalents		(39,018)	(4,959)
Cash and cash equivalents at beginning of period		419,378	360,908
Cash and cash equivalents at end of period		380,360	355,949
Supplemental cash flow information:
Interest paid		109,438	134,872
Income taxes paid		$ 3,349	$ 2,431

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