Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Operating activities
Net income (loss)		$ 730,961	$ 739,134
Adjustments to reconcile net income to net cash provided from (used in) operating activities:
Depreciation and amortization		673,326	603,431
Other amortization expenses		5,419	3,867
Asset Impairment Charges		24,019	2,220
Stock-based compensation expense		20,618	25,655
Loss (gain) on derivatives, net		(2,516)	(58,427)
Loss (gain) on extinguishment of debt, net		9	34,872
Income from unconsolidated entities		7,528	18,231
Rental income in excess of cash received		(60,212)	(86,739)
Amortization related to above (below) market leases, net		362	2,863
Net loss (gain) on sales of properties		(163,881)	(249,002)
Distributions by unconsolidated entities		473	435
Increase (decrease) in accrued expenses and other liabilities		71,797	42,759
Decrease (increase) in receivables and other assets		(35,557)	(42,975)
Net cash provided from (used in) operating activities		1,272,346	1,036,324
Investing activities
Cash disbursed for acquisitions		(1,448,126)	(2,489,345)
Cash disbursed for capital improvements to existing properties		(141,200)	(122,640)
Cash disbursed for construction in progress		(325,372)	(165,311)
Capitalized interest		(12,109)	(6,311)
Investment in real estate loans receivable		(105,496)	(445,985)
Other investments, net of payments		(88,398)	(129,311)
Principal collected on real estate loans receivable		225,092	71,111
Contributions to unconsolidated entities		(41,747)	(139,295)
Distributions by unconsolidated entities		72,564	139,557
Proceeds from (payments on) derivatives investing		56,842	103,615
Decrease (increase) in restricted cash		(21,218)	10,512
Proceeds from sales of real property		538,032	667,761
Net cash provided from (used in) investing activities		(1,291,136)	(2,505,642)
Financing activities
Net increase (decrease) under unsecured lines of credit arrangements		515,000	490,000
Proceeds from issuance of senior unsecured notes		693,560	743,407
Payments to extinguish senior unsecured notes		(400,000)	(534,546)
Secured debt issued		193,541	222,612
Payments on secured debt		(471,898)	(469,455)
Net proceeds from the issuance of common stock		520,067	1,641,981
Decrease (increase) in deferred loan costs		(18,831)	(7,834)
Contributions by noncontrolling interests	[1]	142,381	163,105
Distributions to noncontrolling interests	[1]	(106,076)	(27,439)
Acquisitions of noncontrolling interests		0	(3,154)
Cash distributions to stockholders		(970,436)	(901,618)
Other financing activities		(1,119)	(27,114)
Net cash provided from (used in) financing activities		96,189	1,289,945
Effect of foreign currency translation on cash and cash equivalents		(9,690)	(2,311)
Increase (decrease) in cash and cash equivalents		67,709	(181,684)
Cash and cash equivalents at beginning of period		360,908	473,726
Cash and cash equivalents at end of period		428,617	292,042
Supplemental cash flow information:
Interest paid		360,421	334,511
Income taxes paid		$ 7,070	$ 11,489

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