CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 338,958	$ 354,101
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	389,251	358,864
Amortization of deferred financing costs	5,778	4,383
Amortization of above/below market lease intangibles	2,196	1,717
Amortization of discounts and premiums on debt	3,263	1,391
Amortization of deferred settlements on derivative instruments	9,302	9,246
Write-off of pursuit costs	2,066	1,546
(Income) loss from investments in unconsolidated entities	2,008	1,755
Distributions from unconsolidated entities – return on capital	1,188	1,345
Net (gain) loss on sales of real estate properties	(142,162)	(124,433)
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	17,032	15,027
Changes in assets and liabilities:
(Increase) decrease in other assets	417	(39,845)
Increase (decrease) in accounts payable and accrued expenses	25,396	24,503
Increase (decrease) in accrued interest payable	5,306	(12,123)
Increase (decrease) in other liabilities	2,549	(32,476)
Increase (decrease) in security deposits	1,791	1,024
Net cash provided by operating activities	685,454	559,113
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(200,546)	(57,066)
Investment in real estate – development/other	(76,635)	(175,887)
Capital expenditures to real estate	(85,987)	(89,297)
Non-real estate capital additions	(2,145)	(654)
Interest capitalized for real estate under development	(2,937)	(16,626)
Proceeds from disposition of real estate, net	287,173	297,298
Investments in unconsolidated entities	(3,099)	(2,488)
Distributions from unconsolidated entities – return of capital		113
Net cash provided by (used for) investing activities	(84,176)	(44,607)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(4,354)	(2)
Mortgage notes payable, net:
Lump sum payoffs	(725,639)	(370,420)
Scheduled principal repayments	(3,273)	(6,971)
Notes, net:
Proceeds	497,010
Lump sum payoffs		(394,077)
Line of credit and commercial paper:
Line of credit proceeds	415,000	890,000
Line of credit repayments	(415,000)	(625,000)
Commercial paper proceeds	4,766,050	2,610,863
Commercial paper repayments	(4,720,000)	(2,131,500)
Proceeds from (payments on) settlement of derivative instruments	1,638
Proceeds from Employee Share Purchase Plan (ESPP)	2,181	2,111
Proceeds from exercise of options	2,617	8,143
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	(384,315)	(369,244)
Preferred Shares	(1,545)	(2,318)
Noncontrolling Interests – Operating Partnership	(13,854)	(13,913)
Noncontrolling Interests – Partially Owned Properties	(7,620)	(5,944)
Net cash provided by (used for) financing activities	(613,163)	(420,481)
Net increase (decrease) in cash and cash equivalents and restricted deposits	(11,885)	94,025
Cash and cash equivalents and restricted deposits, beginning of period	100,762	219,088
Cash and cash equivalents and restricted deposits, end of period	88,877	313,113
Cash and cash equivalents	34,507	37,719
Restricted deposits	54,370	275,394
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	188,913	197,336
Net cash paid for income and other taxes	644	624
Amortization of deferred financing costs:
Other assets	1,206	1,206
Mortgage notes payable, net	2,552	1,378
Notes, net	2,020	1,799
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	1,963	195
Notes, net	1,300	1,196
Amortization of deferred settlements on derivative instruments:
Other liabilities	(5)	(5)
Accumulated other comprehensive income	9,307	9,251
Write-off of pursuit costs:
Investment in real estate, net	2,042	1,505
Other assets	10	21
Accounts payable and accrued expenses	14	20
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	1,321	1,025
Other liabilities	687	730
Realized/unrealized (gain) loss on derivative instruments:
Other assets	(13,226)	(2,877)
Notes, net	(2,151)	(630)
Other liabilities	3,382
Accumulated other comprehensive income	11,995	3,507
Investments in unconsolidated entities:
Investments in unconsolidated entities	(2,379)	(1,588)
Other liabilities	(720)	(900)
Debt financing costs:
Notes, net	(4,354)	(2)
Proceeds from (payments on) settlement of derivative instruments:
Other assets	1,638
Mortgage Notes Payable, Net [Member]
Mortgage notes payable, net:
Net gain (loss) on debt extinguishment	$ (22,110)	$ (12,258)