Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating Activities
Net income (loss)	$ 148,597	$ (69,591)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	309,069	218,168
Loss on early extinguishment of debt	670	3,230
Gain on sales of real estate – rental properties	(270)	0
Impairment of real estate	203	193,237
Gain (loss) on sale of real estate - land parcels	(111)	(90)
Equity in (earnings) losses of unconsolidated real estate joint ventures	(15,050)	270
Distributions of earnings from unconsolidated real estate joint ventures	249	286
Amortization of loan fees	8,578	8,792
Amortization of debt premiums/discounts	(1,873)	(117)
Amortization of acquired below-market leases	(14,908)	(2,905)
Deferred rent	(74,362)	(30,679)
Stock compensation expense	18,649	19,007
Investment gains	(8,425)	(28,721)
Investment losses	6,418	10,670
Changes in operating assets and liabilities:
Restricted cash	(912)	(278)
Tenant receivables	(224)	843
Deferred leasing costs	(39,925)	(21,621)
Other assets	(10,662)	(14,813)
Accounts payable, accrued expenses, and tenant security deposits	30,619	6,163
Net cash provided by operating activities	356,330	291,851
Investing Activities
Proceeds from sale of properties	4,263	27,332
Additions to real estate	(660,877)	(638,568)
Purchases of real estate	(590,884)	(18,108)
Deposits for investing activities	4,700	(54,998)
Investments in unconsolidated real estate joint ventures	(248)	(6,924)
Return of capital from unconsolidated real estate joint ventures	38,576	0
Additions to investments	(128,190)	(68,384)
Sales of investments	18,896	35,295
Repayment of notes receivable	0	9,054
Net cash used in investing activities	(1,313,764)	(715,301)
Financing Activities
Borrowings from secured notes payable	145,272	215,330
Repayments of borrowings from secured notes payable	(2,882)	(234,096)
Proceeds from issuance of unsecured senior notes payable	424,384	348,604
Borrowings from unsecured senior line of credit	2,634,000	2,349,000
Repayments of borrowings from unsecured senior line of credit	(2,348,000)	(2,084,000)
Repayments of borrowings from unsecured senior bank term loans	(200,000)	(200,000)
Change in restricted cash related to financing activities	(10,467)	7,742
Payment of loan fees	(4,343)	(16,499)
Repurchase of Series D preferred stock	(17,934)	(98,633)
Redemption of Series E preferred stock	(130,350)	0
Proceeds from the issuance of common stock	705,391	367,802
Dividends on common stock	(229,814)	(177,966)
Dividends on preferred stock	(8,317)	(17,487)
Financing costs paid for sale of noncontrolling interests	0	(8,093)
Contributions from and sale of noncontrolling interests	9,877	68,621
Distributions to and purchase of noncontrolling interests	(17,432)	(62,605)
Net cash provided by financing activities	949,385	457,720
Effect of foreign exchange rate changes on cash and cash equivalents	1,579	(1,440)
Net increase (decrease) in cash and cash equivalents	(6,470)	32,830
Cash and cash equivalents at beginning of period	125,032	125,098
Cash and cash equivalents at end of period	118,562	157,928
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, net of interest capitalized	86,232	58,820
Non-Cash Investing Activities
Change in accrued construction	(38,767)	23,023
Contribution of real estate to an unconsolidated real estate joint venture	6,998	0
Non-Cash Financing Activities
Redemption of redeemable noncontrolling interests	$ 0	$ (5,000)