CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 562,804	$ 498,297
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	583,869	542,964
Amortization of deferred financing costs	9,054	6,447
Amortization of above/below market lease intangibles	3,294	2,729
Amortization of discounts and premiums on debt	21,360	2,018
Amortization of deferred settlements on derivative instruments	13,893	14,010
Impairment	702
Write-off of pursuit costs	3,125	2,329
(Income) loss from investments in unconsolidated entities	2,993	2,153
Distributions from unconsolidated entities – return on capital	1,885	2,031
Net (gain) loss on sales of real estate properties	(256,834)	(141,761)
Net (gain) loss on sales of land parcels	(995)	(19,170)
Net (gain) loss on debt extinguishment	22,110	12,258
Compensation paid with Company Common Shares	22,270	19,999
Changes in assets and liabilities:
(Increase) decrease in other assets	(18,550)	(23,024)
Increase (decrease) in accounts payable and accrued expenses	58,756	62,635
Increase (decrease) in accrued interest payable	11,097	11,865
Increase (decrease) in other liabilities	1,190	(28,250)
Increase (decrease) in security deposits	2,168	2,606
Net cash provided by operating activities	1,044,191	970,136
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(708,092)	(466,395)
Investment in real estate – development/other	(101,573)	(227,187)
Capital expenditures to real estate	(138,119)	(143,258)
Non-real estate capital additions	(3,155)	(776)
Interest capitalized for real estate under development	(4,547)	(23,164)
Proceeds from disposition of real estate, net	691,526	350,000
Investments in unconsolidated entities	(4,860)	(5,324)
Distributions from unconsolidated entities – return of capital		329
Net cash provided by (used for) investing activities	(268,820)	(515,775)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(4,355)	(6,272)
Mortgage notes payable, net:
Lump sum payoffs	(847,939)	(493,420)
Scheduled principal repayments	(4,938)	(8,771)
Notes, net:
Proceeds	497,010	692,466
Lump sum payoffs		(394,077)
Line of credit and commercial paper:
Line of credit proceeds	1,635,000	1,845,000
Line of credit repayments	(1,635,000)	(1,845,000)
Commercial paper proceeds	9,624,610	3,891,596
Commercial paper repayments	(9,425,000)	(3,681,750)
Proceeds from (payments on) settlement of derivative instruments	1,638	1,296
Proceeds from Employee Share Purchase Plan (ESPP)	3,074	2,963
Proceeds from exercise of options	6,000	12,967
Payment of offering costs	(27)	(36)
Other financing activities, net	(48)	(40)
Contributions – Noncontrolling Interests – Partially Owned Properties	125	125
Contributions – Noncontrolling Interests – Operating Partnership	1
Distributions:
Common Shares	(583,184)	(554,267)
Preferred Shares	(2,318)	(2,318)
Noncontrolling Interests – Operating Partnership	(21,040)	(20,604)
Noncontrolling Interests – Partially Owned Properties	(8,882)	(6,873)
Net cash provided by (used for) financing activities	(787,383)	(579,273)
Net increase (decrease) in cash and cash equivalents and restricted deposits	(12,012)	(124,912)
Cash and cash equivalents and restricted deposits, beginning of period	100,762	219,088
Cash and cash equivalents and restricted deposits, end of period	88,750	94,176
Cash and cash equivalents	32,995	46,565
Restricted deposits	55,755	47,611
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	268,966	257,805
Net cash paid for income and other taxes	934	964
Amortization of deferred financing costs:
Other assets	1,809	1,810
Mortgage notes payable, net	4,197	1,943
Notes, net	3,048	2,694
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	19,394	247
Notes, net	1,966	1,771
Amortization of deferred settlements on derivative instruments:
Other liabilities	(9)	(9)
Accumulated other comprehensive income	13,902	14,019
Write-off of pursuit costs:
Investment in real estate, net	3,079	2,292
Other assets	13	17
Accounts payable and accrued expenses	33	20
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	1,973	1,076
Other liabilities	1,020	1,077
Realized/unrealized (gain) loss on derivative instruments:
Other assets	(24,021)	(3,803)
Notes, net	(1,491)	(1,413)
Other liabilities	1,491
Accumulated other comprehensive income	24,021	5,216
Investments in unconsolidated entities:
Investments in unconsolidated entities	(3,180)	(2,324)
Other liabilities	(1,680)	(3,000)
Mortgage Notes Payable, Net [Member]
Mortgage notes payable, net:
Net gain (loss) on debt extinguishment	$ (22,110)	$ (12,258)