CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 223,753	$ 201,744
Adjustments to net income:
Depreciation and amortization	332,192	303,476
Amortization of share-based compensation	9,204	7,598
Non-cash rental adjustments	(7,583)	(6,462)
Amortization of net premiums on mortgages payable	(2,669)	(5,608)
Amortization of deferred financing costs	6,510	6,806
Loss on interest rate swaps	5,835	7,138
Gain on sales of real estate	(15,283)	(17,117)
Provisions for impairment on real estate	16,955	9,182
Change in assets and liabilities
Accounts receivable and other assets	2,964	2,351
Accounts payable, accrued expenses and other liabilities	7,332	(36,160)
Net cash provided by operating activities	579,210	472,948
CASH FLOWS FROM INVESTING ACTIVITIES
Investment in real estate	(1,027,917)	(1,061,871)
Improvements to real estate, including leasing costs	(5,295)	(5,861)
Proceeds from sale of real estate	55,114	51,958
Collection of loans receivable	12,486
Restricted escrow deposits for Section 1031 tax-deferred exchanges and pending acquisitions	(7,757)	20,517
Net cash used in investing activities	(973,369)	(995,257)
CASH FLOWS FROM FINANCING ACTIVITIES
Cash distributions to common stockholders	(453,774)	(392,767)
Cash dividends to preferred stockholders	(20,310)	(20,310)
Borrowings on line of credit	3,120,000	1,059,000
Payments on line of credit	(2,276,000)	(843,000)
Principal payments on notes payable	(275,000)
Proceeds from mortgages payable	9,963
Principal payments on mortgages payable	(183,697)	(140,825)
Proceeds from term loans		250,000
Proceeds from common stock offerings, net	383,572	276,430
Proceeds from dividend reinvestment and stock purchase plan	8,174	360,941
Procceds from At-the-Market (ATM) program	85,780
Redemption of preferred units		(6,750)
Redemption of common units	(9,026)
Distributions to noncontrolling interests	(1,018)	(1,267)
Debt issuance costs		(10,358)
Other items, including shares withheld upon vesting	(4,998)	(5,563)
Net cash provided by financing activities	383,666	525,531
Net (decrease) increase in cash and cash equivalents	(10,493)	3,222
Cash and cash equivalents, beginning of period	40,294	3,852
Cash and cash equivalents, end of period	$ 29,801	$ 7,074