Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017
Operating activities:
Net income		$ 620,828	$ 541,052
Adjustments to reconcile net income to net cash provided from (used in) operating activities:
Depreciation and amortization		464,476	453,124
Other amortization expenses		7,984	7,789
Impairment of assets		32,817	24,662
Stock-based compensation expense		16,725	9,669
Loss (gain) on derivatives and financial instruments, net		(14,633)	1,960
Loss (gain) on extinguishment of debt, net		12,006	36,870
Loss (income) from unconsolidated entities		1,180	27,084
Rental income less than (in excess of) cash received		13,544	(41,325)
Amortization related to above (below) market leases, net		1,363	48
Loss (gain) on real estate dispositions, net		(348,939)	(286,247)
Distributions by unconsolidated entities		21	3,225
Increase (decrease) in accrued expenses and other liabilities		46,718	70,005
Decrease (increase) in receivables and other assets		(15,666)	(3,807)
Net cash provided from (used in) operating activities		838,424	844,109
Investing activities:
Cash disbursed for acquisitions		(595,596)	(237,119)
Cash disbursed for capital improvements to existing properties		(111,332)	(93,147)
Cash disbursed for construction in progress		(62,978)	(149,046)
Capitalized interest		(4,436)	(7,488)
Investment in real estate loans receivable		(48,291)	(50,717)
Principal collected on real estate loans receivable		91,427	36,500
Other investments, net of payments		(48,212)	52,457
Contributions to unconsolidated entities		(32,768)	(65,631)
Distributions by unconsolidated entities		22,897	47,384
Proceeds from (payments on) derivatives		(27,678)	19,665
Proceeds from sales of real property		947,218	1,203,782
Net cash provided from (used in) investing activities		130,251	756,640
Financing activities:
Net increase (decrease) under unsecured credit facilities		(179,000)	(260,000)
Proceeds from issuance of senior unsecured notes		545,074	0
Payments to extinguish senior unsecured notes		(450,000)	0
Net proceeds from the issuance of secured debt		44,606	161,799
Payments on secured debt		(224,958)	(1,020,129)
Net proceeds from the issuance of common stock		10,188	424,451
Redemption of preferred stock		0	(287,500)
Payments for deferred financing costs and prepayment penalties		(18,639)	(52,838)
Contributions by noncontrolling interests(1)	[1]	8,421	9,663
Distributions to noncontrolling interests(1)	[1]	(59,484)	(38,143)
Cash distributions to stockholders		(670,859)	(660,355)
Other financing activities		(5,639)	(8,925)
Net cash provided from (used in) financing activities		(1,000,290)	(1,731,977)
Effect of foreign currency translation on cash, cash equivalents and restricted cash		(5,305)	11,649
Increase (decrease) in cash, cash equivalents and restricted cash		(36,920)	(119,579)
Cash, cash equivalents and restricted cash at beginning of period		309,303	607,220
Cash, cash equivalents and restricted cash at end of period		272,383	487,641
Supplemental cash flow information:
Interest paid		209,156	210,184
Income taxes paid (received), net		$ 4,835	$ 4,360

[1] Includes amounts attributable to redeemable noncontrolling interests.