Simon Property (SPG) 10-Q 7 Aug 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	6 Months Ended
	Jun. 30, 2014
Entity Registrant Name	'SIMON PROPERTY GROUP INC /DE/
Entity Central Index Key	'0001063761
Document Type	'10-Q
Document Period End Date	30-Jun-14
Amendment Flag	'false
Current Fiscal Year End Date	'--12-31
Entity Current Reporting Status	'Yes
Entity Filer Category	'Large Accelerated Filer
Document Fiscal Year Focus	'2014
Document Fiscal Period Focus	'Q2
Common stock	'
Entity Common Stock, Shares Outstanding	310,757,326
Entity Listing, Par Value Per Share	0.0001
Class B common stock	'
Entity Common Stock, Shares Outstanding	8,000
Entity Listing, Par Value Per Share	0.0001

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS:	'	'
Investment properties at cost	$30,951,535	$30,336,639
Less - accumulated depreciation	8,568,672	8,092,794
Investment properties, net	22,382,863	22,243,845
Cash and cash equivalents	1,665,817	1,691,006
Tenant receivables and accrued revenue, net	487,839	520,361
Investment in unconsolidated entities, at equity	2,523,431	2,429,845
Investment in Klepierre, at equity	2,002,587	2,014,415
Deferred costs and other assets	1,523,877	1,422,788
Total assets of discontinued operations	'	3,002,314
Total assets	30,586,414	33,324,574
LIABILITIES:	'	'
Mortgages and unsecured indebtedness	21,901,060	22,669,917
Accounts payable, accrued expenses, intangibles, and deferred revenues	1,147,425	1,223,102
Cash distributions and losses in partnerships and joint ventures, at equity	1,116,301	1,050,278
Other liabilities	280,483	250,371
Total liabilities of discontinued operations	'	1,117,789
Total liabilities	24,445,269	26,311,457
Commitments and contingencies	'	'
Limited partners' preferred interest in the Operating Partnership and noncontrolling redeemable interests in properties	25,537	190,485
Capital stock (850,000,000 total shares authorized, $ 0.0001 par value, 238,000,000 shares of excess common stock, 100,000,000 authorized shares of preferred stock):	'	'
Series J 8 3/8% cumulative redeemable preferred stock, 1,000,000 shares authorized, 796,948 issued and outstanding with a liquidation value of $ 39,847	44,226	44,390
Capital in excess of par value	9,406,570	9,217,363
Accumulated deficit	-4,049,079	-3,218,686
Accumulated other comprehensive loss	-61,736	-75,795
Common stock held in treasury at cost, 3,583,299 and 3,650,680 shares, respectively	-106,748	-117,897
Total stockholders' equity	5,233,264	5,849,406
Noncontrolling interests	882,344	973,226
Total equity	6,115,608	6,822,632
Total liabilities and equity	30,586,414	33,324,574
Common stock	'	'
Capital stock (850,000,000 total shares authorized, $ 0.0001 par value, 238,000,000 shares of excess common stock, 100,000,000 authorized shares of preferred stock):	'	'
Common stock	31	31
Class B common stock	'	'
Capital stock (850,000,000 total shares authorized, $ 0.0001 par value, 238,000,000 shares of excess common stock, 100,000,000 authorized shares of preferred stock):	'	'
Common stock	'	'

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	6 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Capital stock, total shares authorized	850,000,000	850,000,000
Capital stock, par value (in dollars per share)	$0.00	$0.00
Capital stock, shares of excess common stock	238,000,000	238,000,000
Capital stock, authorized shares of preferred stock	100,000,000	100,000,000
Preferred stock stated dividend rate percentage	8.38%	8.38%
Series J 8 3/8% cumulative redeemable preferred stock, shares authorized	1,000,000	1,000,000
Series J 8 3/8% cumulative redeemable preferred stock, shares issued	796,948	796,948
Series J 8 3/8% cumulative redeemable preferred stock, shares outstanding	796,948	796,948
Series J 8 3/8% cumulative redeemable preferred stock, liquidation value (in dollars)	$39,847	$39,847
Common stock held in treasury, shares	3,583,299	3,650,680
Common stock	'	'
Common stock, par value (in dollars per share)	$0.00	$0.00
Common stock, shares authorized	511,990,000	511,990,000
Common stock, shares issued	314,340,625	314,251,245
Common stock, shares outstanding	314,340,625	314,251,245
Class B common stock	'	'
Common stock, par value (in dollars per share)	$0.00	$0.00
Common stock, shares authorized	10,000	10,000
Common stock, shares issued	8,000	8,000
Common stock, shares outstanding	8,000	8,000

Consolidated_Statements_of_Ope

Consolidated Statements of Operations and Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
REVENUE:	'	'	'	'
Minimum rent	$728,486	$674,654	$1,450,768	$1,347,581
Overage rent	39,160	39,077	70,834	74,343
Tenant reimbursements	342,250	307,359	667,721	600,957
Management fees and other revenues	34,142	31,814	64,749	61,543
Other income	37,944	32,089	84,932	61,392
Total revenue	1,181,982	1,084,993	2,339,004	2,145,816
EXPENSES:	'	'	'	'
Property operating	92,630	92,024	187,577	177,568
Depreciation and amortization	287,214	273,537	567,708	544,872
Real estate taxes	99,396	91,014	193,699	180,757
Repairs and maintenance	21,656	21,604	51,421	45,943
Advertising and promotion	38,149	27,552	60,768	46,674
Provision for (recovery of) credit losses	2,442	-495	6,866	1,549
Home and regional office costs	44,958	36,956	80,246	71,850
General and administrative	15,599	15,421	30,454	29,930
Other	18,407	17,441	37,769	34,251
Total operating expenses	620,451	575,054	1,216,508	1,133,394
OPERATING INCOME	561,531	509,939	1,122,496	1,012,422
Interest expense	-254,930	-266,229	-509,164	-537,535
Income and other taxes	-6,626	-8,959	-13,489	-22,074
Income from unconsolidated entities	55,764	56,310	112,842	110,248
Gain upon acquisition of controlling interests and sale or disposal of assets and interests in unconsolidated entities, net	133,870	68,068	136,525	74,683
Consolidated income from continuing operations	489,609	359,129	849,210	637,744
Discontinued operations	26,022	41,396	67,524	97,249
Discontinued operations transaction expenses	-38,163	'	-38,163	'
CONSOLIDATED NET INCOME	477,468	400,525	878,571	734,993
Net income attributable to noncontrolling interests	70,047	59,755	128,667	110,250
Preferred dividends	834	834	1,669	1,669
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	406,587	339,936	748,235	623,074
BASIC EARNINGS PER COMMON SHARE:	'	'	'	'
Income from continuing operations (in dollars per share)	$1.34	$0.99	$2.33	$1.74
Discontinued operations (in dollars per share)	($0.03)	$0.11	$0.08	$0.27
Net income attributable to common stockholders (in dollars per share)	$1.31	$1.10	$2.41	$2.01
DILUTED EARNINGS PER COMMON SHARE:	'	'	'	'
Income from continuing operations (in dollars per share)	$1.34	$0.99	$2.33	$1.74
Discontinued operations (in dollars per share)	($0.03)	$0.11	$0.08	$0.27
Net income attributable to common stockholders (in dollars per share)	$1.31	$1.10	$2.41	$2.01
Consolidated Net Income	477,468	400,525	878,571	734,993
Unrealized (loss) gain on derivative hedge agreements	-8	-1,796	-7,541	5,275
Net loss reclassified from accumulated other comprehensive income into earnings	2,577	2,566	5,274	4,076
Currency translation adjustments	4,046	-22,960	17,779	-21,912
Changes in available-for-sale securities and other	202	-631	682	-815
Comprehensive income	484,285	377,704	894,765	721,617
Comprehensive income attributable to noncontrolling interests	71,020	56,526	130,802	108,302
Comprehensive income attributable to common stockholders	$413,265	$321,178	$763,963	$613,315

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:	'	'
Consolidated Net Income	$878,571	$734,993
Adjustments to reconcile consolidated net income to net cash provided by operating activities -	'	'
Depreciation and amortization	670,714	653,354
Gain upon acquisition of controlling interests and sale or disposal of assets and interests in unconsolidated entities, net	-136,767	-88,835
Straight-line rent	-23,165	-21,595
Equity in income of unconsolidated entities	-113,494	-110,747
Distributions of income from unconsolidated entities	105,087	104,499
Changes in assets and liabilities -	'	'
Tenant receivables and accrued revenue, net	63,647	50,249
Deferred costs and other assets	-45,761	-11,536
Accounts payable, accrued expenses, intangibles, deferred revenues and other liabilities	-127,695	-77,433
Net cash provided by operating activities	1,271,137	1,232,949
CASH FLOWS FROM INVESTING ACTIVITIES:	'	'
Acquisitions	-85,459	-246,574
Funding of loans to related parties	-33,236	-37,773
Repayments of loans to related parties	4,092	'
Capital expenditures, net	-366,034	-394,290
Cash impact from the consolidation of properties	5,402	'
Net proceeds from sale of assets	'	183,026
Investments in unconsolidated entities	-115,827	-37,413
Purchase of marketable and non-marketable securities	-9,201	-19,850
Proceeds from sale of marketable and non-marketable securities	'	47,495
Distributions of capital from unconsolidated entities	287,870	387,668
Net cash used in investing activities	-312,393	-117,711
CASH FLOWS FROM FINANCING ACTIVITIES:	'	'
Proceeds from sales of common stock and other, net of transaction costs	-71	216
Cash impact of Washington Prime spin-off	-33,776	'
Purchase of noncontrolling interest in consolidated properties	-89,818	'
Distributions to noncontrolling interest holders in properties	-18,164	-4,939
Contributions from noncontrolling interest holders in properties	388	218
Preferred distributions of the Operating Partnership	-957	-957
Preferred dividends and distributions to stockholders	-793,892	-715,061
Distributions to limited partners	-133,858	-119,729
Proceeds from issuance of debt, net of transaction costs	1,405,336	896,457
Repayments of debt	-2,348,113	-1,260,132
Proceeds from issuance of debt related to Washington Prime properties, net	1,003,135	'
Net cash used in financing activities	-1,009,790	-1,203,927
DECREASE IN CASH AND CASH EQUIVALENTS (Note 3)	-51,046	-88,689
CASH AND CASH EQUIVALENTS, beginning of period	1,691,006	1,184,518
CASH AND CASH EQUIVALENTS, end of period	$1,665,817	$1,095,829

Organization

Organization	6 Months Ended
	Jun. 30, 2014
Organization	'
Organization	'
	1. Organization
	Simon Property Group, Inc., or Simon, is a Delaware corporation that operates as a self-administered and self-managed real estate investment trust, or REIT, under the Internal Revenue Code of 1986, as amended. REITs will generally not be liable for federal corporate income taxes as long as they continue to distribute not less than 100% of their taxable income. Simon Property Group, L.P., or the Operating Partnership, is our majority-owned partnership subsidiary that owns all of our real estate properties and other assets. In these condensed notes to the unaudited consolidated financial statements, the terms "we", "us" and "our" refer to Simon, the Operating Partnership, and its subsidiaries.
	We own, develop and manage retail real estate properties, which consist primarily of malls, Premium Outlets®, and The Mills®. As of June 30, 2014, we owned or held an interest in 208 income-producing properties in the United States, which consisted of 115 malls, 66 Premium Outlets, 13 Mills, and 14 other shopping centers or outlet centers in 37 states and Puerto Rico. Internationally, as of June 30, 2014, we had ownership interests in nine Premium Outlets in Japan, three Premium Outlets in South Korea, one Premium Outlet in Canada, one Premium Outlet in Mexico, and one Premium Outlet in Malaysia. As of June 30, 2014, we had noncontrolling ownership interests in five outlet properties in Europe through our joint venture with McArthurGlen. Of the five properties, two are located in Italy and one each is located in Austria, the Netherlands, and the United Kingdom. Additionally, as of June 30, 2014, we owned a 28.9% equity stake in Klépierre SA, or Klépierre, a publicly traded, Paris-based real estate company, which owns, or has an interest in, shopping centers located in 13 countries in Europe.
	On May 28, 2014, as further discussed in Note 3, we completed the spin-off of our interests in 98 properties comprised of substantially all of our strip center business and our smaller enclosed malls to Washington Prime Group Inc., or Washington Prime, an independent, publicly traded REIT. The historical results of operations of the Washington Prime properties as well as the related assets and liabilities are presented as discontinued operations in the accompanying consolidated financial statements.

Basis_of_Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2014
Basis of Presentation	'
Basis of Presentation	'
	2. Basis of Presentation
	The accompanying unaudited consolidated financial statements include the accounts of all controlled subsidiaries, and all significant intercompany amounts have been eliminated. Due to the seasonal nature of certain operational activities, the results for the interim period ended June 30, 2014, are not necessarily indicative of the results to be expected for the full year.
	These consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and include all of the information and disclosures required by accounting principles generally accepted in the United States (GAAP) for interim reporting. Accordingly, they do not include all of the disclosures required by GAAP for complete financial statements. In the opinion of management, all adjustments necessary for fair presentation (including normal recurring accruals) have been included. The consolidated financial statements in this Form 10-Q should be read in conjunction with the audited consolidated financial statements and related notes contained in our 2013 Annual Report on Form 10-K.
	As of June 30, 2014, we consolidated 136 wholly-owned properties and 13 additional properties that are less than wholly-owned, but which we control or for which we are the primary beneficiary. We account for the remaining 79 properties, or the joint venture properties, as well as our investment in Klépierre, using the equity method of accounting, as we have determined we have significant influence over their operations. We manage the day-to-day operations of 56 of the 79 joint venture properties, but have determined that our partner or partners have substantive participating rights with respect to the assets and operations of these joint venture properties. Our investments in joint ventures in Japan, South Korea, Canada, Mexico, Malaysia, and the five properties through our joint venture with McArthurGlen comprise 20 of the remaining 23 properties. The international properties are managed locally by joint ventures in which we share control.
	Preferred distributions of the Operating Partnership are accrued at declaration and represent distributions on outstanding preferred units of partnership interests held by limited partners, or preferred units, and are included in net income attributable to noncontrolling interests. We allocate net operating results of the Operating Partnership after preferred distributions to third parties and to us based on the partners' respective weighted average ownership interests in the Operating Partnership. Net operating results of the Operating Partnership attributable to third parties are reflected in net income attributable to noncontrolling interests. Our weighted average ownership interest in the Operating Partnership was 85.5% and 85.6% for the six months ended June 30, 2014 and 2013, respectively. As of June 30, 2014 and December 31, 2013, our ownership interest in the Operating Partnership was 85.4% and 85.7%, respectively. We adjust the noncontrolling limited partners' interests at the end of each period to reflect their interest in the Operating Partnership.
	Reclassifications
	We made certain reclassifications of prior period amounts in the consolidated financial statements to conform to the 2014 presentation. These reclassifications had no impact on previously reported net income attributable to common stockholders or earnings per share.

Significant_Accounting_Policie

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2014
Significant Accounting Policies	'
Significant Accounting Policies	'
	3. Significant Accounting Policies
	Cash and Cash Equivalents
	We consider all highly liquid investments purchased with an original maturity of 90 days or less to be cash and cash equivalents. Cash equivalents are carried at cost, which approximates fair value. Cash equivalents generally consist of commercial paper, bankers' acceptances, Eurodollars, repurchase agreements, and money market deposits or securities. Financial instruments that potentially subject us to concentrations of credit risk include our cash and cash equivalents and our trade accounts receivable. We place our cash and cash equivalents with institutions with high credit quality. However, at certain times, such cash and cash equivalents are in excess of FDIC and SIPC insurance limits.
	Marketable and Non-Marketable Securities
	Marketable securities consist primarily of the investments of our captive insurance subsidiaries, available-for-sale securities, our deferred compensation plan investments, and certain investments held to fund the debt service requirements of debt previously secured by investment properties.
	The types of securities included in the investment portfolio of our captive insurance subsidiaries typically include U.S. Treasury or other U.S. government securities as well as corporate debt securities with maturities ranging from less than 1 to 10 years. These securities are classified as available-for-sale and are valued based upon quoted market prices or other observable inputs when quoted market prices are not available. The amortized cost of debt securities, which approximates fair value, held by our captive insurance subsidiaries is adjusted for amortization of premiums and accretion of discounts to maturity. Changes in the values of these securities are recognized in accumulated other comprehensive income (loss) until the gain or loss is realized or until any unrealized loss is deemed to be other-than-temporary. We review any declines in value of these securities for other-than-temporary impairment and consider the severity and duration of any decline in value. To the extent an other-than-temporary impairment is deemed to have occurred, an impairment charge is recorded and a new cost basis is established. Subsequent changes are then recognized through other comprehensive income (loss) unless another other-than-temporary impairment is deemed to have occurred. Net unrealized gains recorded in other comprehensive income (loss) as of June 30, 2014 and December 31, 2013 were approximately $1.8 million and $1.1 million, respectively, and represent the valuation and related currency adjustments for our marketable securities.
	Our insurance subsidiaries are required to maintain statutory minimum capital and surplus as well as maintain a minimum liquidity ratio. Therefore, our access to these securities may be limited. Our deferred compensation plan investments are classified as trading securities and are valued based upon quoted market prices. The investments have a matching liability as the amounts are fully payable to the employees that earned the compensation. Changes in value of these securities and changes to the matching liability to employees are both recognized in earnings and, as a result, there is no impact to consolidated net income.
	At June 30, 2014 and December 31, 2013, we had investments of $118.8 million in non-marketable securities that we account for under the cost method. We regularly evaluate these investments for any other-than-temporary impairment in their estimated fair value and determined that no adjustment in the carrying value was required.
	Fair Value Measurements
	Level 1 fair value inputs are quoted prices for identical items in active, liquid and visible markets such as stock exchanges. Level 2 fair value inputs are observable information for similar items in active or inactive markets, and appropriately consider counterparty creditworthiness in the valuations. Level 3 fair value inputs reflect our best estimate of inputs and assumptions market participants would use in pricing an asset or liability at the measurement date. The inputs are unobservable in the market and significant to the valuation estimate. We have no investments for which fair value is measured on a recurring basis using Level 3 inputs.
	We held marketable securities that totaled $159.7 million and $148.3 million at June 30, 2014 and December 31, 2013, respectively, that were primarily classified as having Level 1 fair value inputs. In addition, we have derivative instruments which are classified as having Level 2 inputs which consist primarily of interest rate swap agreements and foreign currency forward contracts with a gross liability balance of $0.1 million and $1.2 million at June 30, 2014 and December 31, 2013, respectively, and a gross asset value of $0.3 million and $8.4 million at June 30, 2014 and December 31, 2013, respectively. We also have interest rate cap agreements with nominal values.
	Note 6 includes a discussion of the fair value of debt measured using Level 2 inputs. Notes 5 and 9 include discussion of the fair values recorded in purchase accounting and impairment, using Level 2 and Level 3 inputs. Level 3 inputs to our purchase accounting and impairment include our estimations of net operating results of the property, capitalization rates and discount rates.
	Noncontrolling Interests
	Details of the carrying amount of our noncontrolling interests are as follows:
		As of			As of
		June 30,			December 31,
		2014			2013
	Limited partners' interests in the Operating Partnership	$	883,987		$	968,962
	Nonredeemable noncontrolling (deficit) interests in properties, net		(1,643	)		4,264
	Total noncontrolling interests reflected in equity	$	882,344		$	973,226
	Net income attributable to noncontrolling interests (which includes nonredeemable noncontrolling interests in consolidated properties, limited partners' interests in the Operating Partnership, redeemable noncontrolling interests in consolidated properties and preferred distributions payable by the Operating Partnership on its outstanding preferred units) is a component of consolidated net income. In addition, the individual components of other comprehensive income (loss) are presented in the aggregate for both controlling and noncontrolling interests, with the portion attributable to noncontrolling interests deducted from comprehensive income attributable to common stockholders.
	A rollforward of noncontrolling interests reflected in equity is as follows:
		For the Three						For the Six
		Months Ended						Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
	Noncontrolling interests, beginning of period	$	989,988		$	977,753		$	973,226		$	982,486
	Net income attributable to noncontrolling interests after preferred distributions and income attributable to redeemable noncontrolling interests in consolidated properties		70,060			57,202			127,710			104,761
	Distributions to noncontrolling interest holders		(74,029	)		(60,082	)		(151,465	)		(119,907	)
	Other comprehensive income (loss) allocable to noncontrolling interests:
	Unrealized (loss) gain on derivative hedge agreements		(17	)		(219	)		(1,253	)		740
	Net loss reclassified from accumulated other comprehensive loss into earnings		376			368			768			586
	Currency translation adjustments		586			(3,285	)		2,518			(3,158	)
	Changes in available-for-sale securities and other		30			(92	)		102			(117	)
			975			(3,228	)		2,135			(1,949	)
	Adjustment to limited partners' interest from change in ownership in the Operating Partnership		(121,454	)		(7,934	)		(188,680	)		(10,581	)
	Units issued to limited partners		—			—			84,910			—
	Units exchanged for common shares		(279	)		(3,461	)		(1,190	)		(5,982	)
	Long-term incentive performance units		12,484			11,248			24,969			22,670
	Purchase and disposition of noncontrolling interests, net, and other		4,599			—			10,729			—
	Noncontrolling interests, end of period	$	882,344		$	971,498		$	882,344		$	971,498
	Temporary Equity
	The remaining interests in a property or portfolio of properties which are redeemable at the option of the holder or in circumstances that may be outside our control, are accounted for as temporary equity within limited partners' preferred interest in the Operating Partnership and noncontrolling redeemable interests in properties in the accompanying consolidated balance sheets. The carrying amount of each noncontrolling interest is adjusted to the redemption amount assuming the interest is redeemable at the balance sheet date.
	As discussed in Note 9, on January 10, 2014, we acquired one of our partner's redeemable interests in a portfolio of properties. During the three months ended June 30, 2014, in connection with the resolution of all partnership disputes with related party limited partners in one of our partnerships, we contributed $83.0 million into the partnership in exchange for a new series of preferred partnership units that carry a 2.5% preferred return. Amounts due upon a future exercise of the limited partners' right to cause us to redeem their noncontrolling interests would be net of this preferred investment. Accordingly, this preferred investment contractually offsets the mezzanine liability previously recognized on the accompanying consolidated balance sheet.
	Changes in the redemption value of the underlying noncontrolling interest are recorded within accumulated deficit. If and to the extent the value of the redemption right exceeds the fair value of the limited partners' interests in the partnership, earnings will be charged. There are no noncontrolling interests redeemable at amounts in excess of fair value at June 30, 2014.
	Accumulated Other Comprehensive Income (Loss)
	The changes in accumulated other comprehensive income (loss) net of noncontrolling interest by component consisted of the following as of June 30, 2014:
		Currency			Accumulated			Net unrealized			Total
		translation			derivative			gains on
		adjustments			losses, net			marketable
								securities
	Beginning balance	$	(23,781	)	$	(52,985	)	$	971		$	(75,795	)
	Other comprehensive income (loss) before reclassifications		15,261			(6,288	)		580			9,553
	Amounts reclassified from accumulated other comprehensive income (loss)		—			4,506			—			4,506
	Net current-period other comprehensive income (loss)		15,261			(1,782	)		580			14,059
	Ending balance	$	(8,520	)	$	(54,767	)	$	1,551		$	(61,736	)
	The reclassifications out of accumulated other comprehensive income (loss) consisted of the following as of June 30, 2014 and 2013:
		June 30, 2014			June 30, 2013
	Details about	Amount reclassified from			Amount reclassified from			Affected line item in the statement where net
	accumulated other	accumulated other			accumulated other			income is presented
	comprehensive income	comprehensive income (loss)			comprehensive income (loss)
	(loss) components:
	Accumulated derivative losses, net	$	(5,274	)	$	(4,076	)	Interest expense
		768			586		Net income attributable to noncontrolling interests
	$	(4,506	)	$	(3,490	)
Derivative Financial Instruments
We record all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether we have designated a derivative as a hedge and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. We may use a variety of derivative financial instruments in the normal course of business to selectively manage or hedge a portion of the risks associated with our indebtedness and interest payments. Our objectives in using interest rate derivatives are to add stability to interest expense and to manage our exposure to interest rate movements. To accomplish this objective, we primarily use interest rate swaps and caps. We require that hedging derivative instruments be highly effective in reducing the risk exposure that they are designated to hedge. As a result, there is no significant ineffectiveness from any of our derivative activities. We formally designate any instrument that meets these hedging criteria as a hedge at the inception of the derivative contract. We have no credit-risk-related hedging or derivative activities.
As of June 30, 2014, we had no outstanding interest rate derivatives. The carrying value of our interest rate swap agreements, at fair value, as of December 31, 2013, was a net asset balance of $3.0 million, of which $0.4 million was included in other liabilities and $3.4 million was included in deferred costs and other assets. The interest rate caps were of nominal value at December 31, 2013 and we generally do not apply hedge accounting to these arrangements.
We are also exposed to fluctuations in foreign exchange rates on financial instruments which are denominated in foreign currencies, primarily in Japan and Europe. We use currency forward contracts and foreign currency denominated debt to manage our exposure to changes in foreign exchange rates on certain Yen and Euro-denominated receivables and net investments. Currency forward contracts involve fixing the Yen:USD or Euro:USD exchange rate for delivery of a specified amount of foreign currency on a specified date. The currency forward contracts are typically cash settled in US dollars for their fair value at or close to their settlement date. Approximately ¥1.5 billion remains as of June 30, 2014 for all forward contracts that we expect to receive through January 5, 2015. The June 30, 2014 carrying value was a net $0.2 million, of which $0.3 million is included in deferred costs and other assets and $0.1 million is included in other liabilities. We have reported the changes in fair value for these forward contracts in earnings. The underlying currency adjustments on the foreign currency denominated receivables are also reported in income and generally offset the amounts in earnings for these forward contracts.
In the fourth quarter of 2013, we entered into a Euro:USD forward contract with a €74.0 million notional value, which we designated as a net investment hedge, that matured on May 30, 2014. The liability balance related to this forward contract was $0.8 million and included in other liabilities as of December 31, 2013. We applied hedge accounting to this forward contract and reported the change in fair value in other comprehensive income (loss). Changes in the value of this forward contract are offset by changes in the underlying hedged Euro-denominated joint venture investment.
The total gross accumulated other comprehensive loss related to our derivative activities, including our share of the other comprehensive loss from joint venture properties, approximated $64.1 million and $61.8 million as of June 30, 2014 and December 31, 2013, respectively.
New Accounting Pronouncements
In April 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity." ASU No. 2014-08 changes the definition of a discontinued operation to include only those disposals of components of an entity that represent a strategic shift that has (or will have) a major effect on an entity's operations and financial results. ASU No. 2014-08 is effective prospectively for fiscal years beginning after December 15, 2014, but can be early-adopted. We early adopted ASU No. 2014-08 and are applying the revised definition to all disposals on a prospective basis, including the spin-off of Washington Prime as further discussed below. ASU 2014-08 also requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation.
In May 2014, the FASB issued ASU 2014-09, "Revenue From Contracts With Customers." ASU 2014-09 amends the existing accounting standards for revenue recognition and is based on principles that govern the recognition of revenue at an amount an entity expects to be entitled when products are transferred to customers. ASU 2014-09 will be effective for us beginning in its first quarter of 2017. Early adoption is not permitted. The new revenue standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of adoption. We are currently evaluating the impact of adopting the new revenue standard on our consolidated financial statements.
Transaction Expenses
We expense acquisition, potential acquisition and disposition related costs as they are incurred. We incurred $38.2 million in transaction costs during the first six months of 2014 related to the spin-off of Washington Prime. Other than these transaction costs, we incurred a minimal amount of transaction expenses during the six months ended June 30, 2014 and 2013.
Discontinued Operations
On May 28, 2014, we completed the spin-off of our interests in 98 properties comprised of substantially all of our strip center business and our smaller enclosed malls to Washington Prime, an independent, publicly traded REIT. The spin-off was effectuated through a distribution of the common shares of Washington Prime to holders of Simon common stock as of the distribution record date, and qualified as a tax-free distribution for U.S. federal income tax purposes. For every two shares of Simon common stock held as of the record date of May 16, 2014, Simon stockholders received one Washington Prime common share on May 28, 2014. At the time of the separation and distribution, Washington Prime owned a percentage of the outstanding units of partnership interest of Washington Prime Group, L.P. that was approximately equal to the percentage of outstanding units of partnership interest of the Operating Partnership, or units, owned by us. The remaining units of Washington Prime Group, L.P. were owned by limited partners of the Operating Partnership who received one Washington Prime Group, L.P. unit for every two units they owned in the Operating Partnership. Subsequent to the spin-off, we retained a nominal interest in Washington Prime Group, L.P. We also retained approximately $1.0 billion of proceeds from recently completed unsecured debt and mortgage debt as part of the spin-off.
The historical results of operations of the Washington Prime properties have been presented as discontinued operations in the consolidated statements of operations and comprehensive income. Discontinued operations also include transaction costs of $38.2 million we incurred to spin-off Washington Prime. In addition, the assets and liabilities of Washington Prime are presented separately from assets and liabilities from continuing operations in the accompanying consolidated balance sheets. The accompanying consolidated statement of cash flows includes within operating, investing and financing cash flows those activities which related to our period of ownership of the Washington Prime properties.
The following is a summary of the assets and liabilities transferred to Washington Prime as part of the spin-off (dollars in millions):
	May 28,			December 31,
	2014			2013
ASSETS:
Investment properties at cost	$	4,802,975		$	4,789,705
Less — accumulated depreciation		2,034,615			1,974,949
		2,768,360			2,814,756
Cash and cash equivalents		33,776			25,857
Tenant receivables and accrued revenue, net		53,662			61,121
Investment in unconsolidated entities, at equity		5,189			3,554
Deferred costs and other assets		110,365			97,026
Total assets	$	2,971,352		$	3,002,314
LIABILITIES:
Mortgages and unsecured indebtedness	$	1,929,019		$	918,614
Accounts payable, accrued expenses, intangibles, and deferred revenues		112,390			151,011
Cash distributions and losses in partnerships and joint ventures, at equity		41,623			41,313
Other liabilities		36,927			6,851
Total liabilities		2,119,959			1,117,789
Net Assets Transferred to Washington Prime	$	851,393		$	1,884,525
The results of the discontinued operations through the May 28, 2014 date of the spin-off are included in the consolidated results for the three and six months ended June 30, 2014. Summarized financial information for discontinued operations for the three and six month periods ended June 30, 2014 and 2013 is as follows (dollars in millions).
	Three Months ended						Six Months ended
	June 30,						June 30,
	2014			2013			2014			2013
TOTAL REVENUE	$	104,683		$	151,570		$	262,652		$	305,805
Property operating		17,035			25,455			43,175			49,820
Depreciation and amortization		31,024			45,101			76,992			90,400
Real estate taxes		12,526			18,395			32,474			38,357
Repairs and maintenance		3,181			5,503			10,331			10,889
Advertising and promotion		1,388			1,808			3,340			3,945
Provision for (recovery of) credit losses		708			(806	)		1,494			(116	)
Other		910			1,163			2,028			2,354
Total operating expenses		66,772			96,619			169,834			195,649
OPERATING INCOME		37,911			54,951			92,818			110,156
Interest expense		(12,159	)		(13,737	)		(26,076	)		(27,456	)
Income and other taxes		(37	)		(24	)		(112	)		(102	)
Income from unconsolidated entities		307			206			652			499
Gain upon acquisition of controlling interests and sale or disposal of assets and interests in unconsolidated entities, net		—			—			242			14,152
CONSOLIDATED NET INCOME		26,022			41,396			67,524			97,249
Net income attributable to noncontrolling interests		3,792			5,963			9,781			13,995
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	$	22,230		$	35,433		$	57,743		$	83,254
Capital expenditures on a cash basis (in millions) for the three month periods ended June 30, 2014 and 2013 were $7.1 and $18.3, respectively, and for the six month periods ended June 30, 2014 and 2013 were $31.9 and $42.5, respectively.
We and Washington Prime entered into property management and transitional services agreements in connection with the spin-off whereby we will provide certain services to Washington Prime and its properties. Pursuant to the terms of the property management agreements, we will manage, lease, and maintain Washington Prime's mall properties under the direction of Washington Prime. In exchange, Washington Prime will pay us annual fixed rate property management fees ranging from 2.5% to 4.0% of base minimum and percentage rents, will reimburse us for direct out-of-pocket costs and expenses and will also pay us separate fees for leasing and development services provided by us. The property management agreements have an initial term of two years with automatic one year renewals unless terminated. Either party may terminate the property management agreement on or after the two-year anniversary of the spin-off upon 180 days prior written notice.
We will also provide certain support services to the Washington Prime strip centers and certain of its central functions that will enable Washington Prime to establish its stand-alone processes for various activities that were previously provided by us and does not constitute significant continuing support of Washington Prime's operations. These services include assistance in the areas of information technology, treasury and financial management, payroll, lease administration, taxation and procurement. The charges for such services are intended to allow us to recover the costs of providing these services. The transition services agreement will terminate no later than two years following the date of the spin-off subject to a minimum notice period equal to the shorter of 180 days or one-half of the original service period.
Management and transitional services fees earned for the three and six month periods ended June 30, 2014 were not significant.

Per_Share_Data

Per Share Data	6 Months Ended
	Jun. 30, 2014
Per Share Data	'
Per Share Data	'
	4. Per Share Data
	We determine basic earnings per share based on the weighted average number of shares of common stock outstanding during the period and we consider any participating securities for purposes of applying the two-class method. We determine diluted earnings per share based on the weighted average number of shares of common stock outstanding combined with the incremental weighted average shares that would have been outstanding assuming all potentially dilutive securities were converted into common shares at the earliest date possible. The following table sets forth the computation of our basic and diluted earnings per share.
		For the Three Months				For the Six Months
		Ended June 30,				Ended June 30,
		2014		2013		2014		2013
	Net Income attributable to Common Stockholders — Basic and Diluted	$	406,587	$	339,936	$	748,235	$	623,074
	Weighted Average Shares Outstanding — Basic		310,743,242		310,261,278		310,683,240		310,124,651
	Effect of stock options		—		—		—		103
	Weighted Average Shares Outstanding — Diluted		310,743,242		310,261,278		310,683,240		310,124,754
	For the six months ended June 30, 2014, potentially dilutive securities include units that are exchangeable for common stock and long-term incentive performance, or LTIP, units granted under our long-term incentive performance programs that are convertible into units and exchangeable for common stock. No securities had a dilutive effect for the six months ended June 30, 2014. The only securities that had a dilutive effect for the six months ended June 30, 2013 were stock options. We accrue dividends when they are declared.

Investment_in_Unconsolidated_E

Investment in Unconsolidated Entities	6 Months Ended
	Jun. 30, 2014
Investment in Unconsolidated Entities	'
Investment in Unconsolidated Entities	'
	5. Investment in Unconsolidated Entities
	Real Estate Joint Ventures and Investments
	Joint ventures are common in the real estate industry. We use joint ventures to finance properties, develop new properties and diversify our risk in a particular property or portfolio of properties. As discussed in Note 2, we held joint venture interests in 79 properties as of June 30, 2014.
	Certain of our joint venture properties are subject to various rights of first refusal, buy-sell provisions, put and call rights, or other sale or marketing rights for partners which are customary in real estate joint venture agreements and the industry. We and our partners in these joint ventures may initiate these provisions (subject to any applicable lock up or similar restrictions), which may result in either the sale of our interest or the use of available cash or borrowings, or the use of limited partnership interests in the Operating Partnership, to acquire the joint venture interest from our partner.
	We may provide financing to joint ventures primarily in the form of interest bearing construction loans. As of June 30, 2014 and December 31, 2013, we had construction loans and other advances to related parties totaling $173.8 million and $140.3 million, respectively, which are included in deferred costs and other assets.
	Unconsolidated Property Transactions
	On January 30, 2014, as discussed in Note 9, we acquired the remaining 50% interest in Arizona Mills from our joint venture partner. The consolidation of this previously unconsolidated property resulted in a remeasurement of our previously held interest to fair value and a corresponding non-cash gain of $2.7 million in the first quarter of 2014. As a result of this acquisition, we now own 100% of this property.
	As discussed in Notes 1 and 3, on May 28, 2014, we completed the spin-off of Washington Prime, which included ten unconsolidated properties. The net income of these ten properties is included in income from operations of discontinued joint venture interests and the net assets and liabilities of these properties are included in the total assets and total liabilities of discontinued operations, respectively, in the accompanying summary financial information.
	European Investments
	At June 30, 2014, we owned 57,634,148 shares, or approximately 28.9%, of Klépierre, which had a quoted market price of $50.78 per share. Our share of net income, net of amortization of our excess investment, was $135.9 million for the six months ended June 30, 2014, which includes the disposal gain discussed below, and $23.3 million for the six months ended June 30, 2013. Based on applicable Euro:USD exchange rates and after our conversion of Klépierre's results to GAAP, Klépierre's total revenues, operating income and consolidated net income were approximately $654.8 million, $281.1 million and $1.2 billion, respectively, for the six months ended June 30, 2014 and $725.6 million, $282.9 million and $97.9 million, respectively, for the six months ended June 30, 2013. On April 16, 2014, Klépierre completed the disposal of a portfolio of 126 retail galleries located in France, Spain and Italy. Total gross consideration for the transaction, including transfer duties, was €1.98 billion (€1.65 billion Klépierre's group share). The net cash proceeds were used by Klépierre to reduce its overall indebtedness. In connection with this transaction, we recorded a gain of $133.9 million, net of the write-off of a portion of our excess investment, which is included in "Gain upon acquisition of controlling interests and sale or disposal of assets and interest in unconsolidated entities, net" in the accompanying consolidated statements of operations and comprehensive income.
	During the second quarter of 2013, we signed a definitive agreement with McArthurGlen, an owner, developer, and manager of designer outlets, to form one or more joint ventures to invest in certain existing designer outlets, development projects, and its property management and development companies. In conjunction with that agreement, we purchased a noncontrolling interest in the property management and development companies of McArthurGlen and a noncontrolling interest in a development property located in Vancouver, British Colombia. On August 2, 2013 we acquired a noncontrolling interest in Ashford Designer Outlet in Kent, UK. On October 16, 2013 we completed the remaining transactions contemplated by our previously announced definitive agreement with McArthurGlen by acquiring noncontrolling interests in portions of four existing McArthurGlen Designer Outlets — Parndorf (Vienna, Austria), La Reggia (Naples, Italy), Noventa di Piave (Venice, Italy), and Roermond (Roermond, Netherlands). During the quarter ended June 30, 2014, we purchased an additional 22.5% noncontrolling interest in Ashford Designer Outlet, increasing our ownership interest in this property to 45%. At June 30, 2014, our legal ownership interests in these properties range from 45% to 90%. The aggregate consideration for the 2013 transactions was $496.7 million and is subject to further adjustment based upon contractual obligations and customary purchase price adjustments. The carrying amount of our investment in these joint ventures, including all related components of accumulated other comprehensive income (loss) as well as subsequent capital contributions for development, was $674.8 million and $510.7 million as of June 30, 2014 and December 31, 2013, respectively. The change in the carrying amount of the investment in 2014 was driven by the additional investment discussed above and adjustments to our preliminary purchase accounting including our estimate of the aggregate consideration. Substantially all of our investment has been deemed excess investment and has been preliminarily allocated to the underlying investment property based on estimated fair values. The preliminary allocations are subject to revision within the measurement period, not to exceed one year from the date of the acquisitions.
	We also have a minority interest in Value Retail PLC, which owns and operates nine luxury outlets throughout Europe and an additional direct minority ownership in three of those outlets. Our investment in these centers is accounted for under the cost method. At June 30, 2014 and December 31, 2013, the carrying value of these investments was $115.4 million and is included in deferred costs and other assets.
	Asian Joint Ventures
	We conduct our international Premium Outlet operations in Japan through a joint venture with Mitsubishi Estate Co., Ltd. We have a 40% ownership interest in this joint venture. The carrying amount of our investment in this joint venture was $262.8 million and $261.1 million as of June 30, 2014 and December 31, 2013, respectively, including all related components of accumulated other comprehensive income (loss). We conduct our international Premium Outlet operations in South Korea through a joint venture with Shinsegae International Co. We have a 50% ownership interest in this joint venture. The carrying amount of our investment in this joint venture was $95.8 million and $76.4 million as of June 30, 2014 and December 31, 2013, respectively, including all related components of accumulated other comprehensive income (loss).
	Summary Financial Information
	A summary of our equity method investments and share of income from such investments, excluding Klépierre, follows.
	BALANCE SHEETS
		June 30,			December 31,
		2014			2013
	Assets:
	Investment properties, at cost	$	15,842,291		$	15,355,700
	Less — accumulated depreciation		5,280,359			5,080,832
			10,561,932			10,274,868
	Cash and cash equivalents		756,563			781,554
	Tenant receivables and accrued revenue, net		304,679			302,902
	Investment in unconsolidated entities, at equity		28,517			38,352
	Deferred costs and other assets		589,390			579,480
	Total assets of discontinued operations		—			281,000
	Total assets	$	12,241,081		$	12,258,156
	Liabilities and Partners' Deficit:
	Mortgages	$	12,764,686		$	12,753,139
	Accounts payable, accrued expenses, intangibles, and deferred revenue		980,159			834,898
	Other liabilities		568,158			513,897
	Total liabilities of discontinued operations		—			286,252
	Total liabilities		14,313,003			14,388,186
	Preferred units		67,450			67,450
	Partners' deficit		(2,139,372	)		(2,197,480	)
	Total liabilities and partners' deficit	$	12,241,081		$	12,258,156
	Our Share of:
	Partners' deficit	$	(541,435	)	$	(717,776	)
	Add: Excess Investment		1,948,565			2,059,584
	Add: Our Share of investment in discontinued unconsolidated entities, at equity		—			37,759
	Our net investment in unconsolidated entities, at equity	$	1,407,130		$	1,379,567
	"Excess Investment" represents the unamortized difference of our investment over our share of the equity in the underlying net assets of the joint ventures or other investments acquired and is allocated on a fair value basis primarily to investment property, lease related intangibles, and debt premiums and discounts. We amortize excess investment over the life of the related depreciable components of investment property, typically no greater than 40 years, the terms of the applicable leases and the applicable debt maturity, respectively. The amortization is included in the reported amount of income from unconsolidated entities.
	STATEMENTS OF OPERATIONS
		For the Three Months						For the Six Months
		Ended June 30,						Ended June 30,
		2014			2013			2014			2013
	Revenue:
	Minimum rent	$	427,899		$	387,600		$	852,684		$	769,072
	Overage rent		41,589			39,997			90,386			87,613
	Tenant reimbursements		193,006			182,799			385,799			362,393
	Other income		61,929			39,397			174,635			81,392
	Total revenue		724,423			649,793			1,503,504			1,300,470
	Operating Expenses:
	Property operating		131,643			120,462			293,064			233,539
	Depreciation and amortization		142,047			122,981			294,195			246,595
	Real estate taxes		52,797			48,060			107,588			100,678
	Repairs and maintenance		15,944			15,576			35,585			31,118
	Advertising and promotion		17,113			13,967			35,923			29,661
	Provision for credit losses		970			375			4,078			1,512
	Other		44,554			36,170			97,483			71,783
	Total operating expenses		405,068			357,591			867,916			714,886
Operating Income		319,355			292,202			635,588			585,584
Interest expense		(150,059	)		(150,887	)		(301,696	)		(294,692	)
Income from Continuing Operations		169,296			141,315			333,892			290,892
Income from operations of discontinued joint venture interests		2,094			2,892			5,079			6,629
Gain on disposal of discontinued operations, net		—			18,356			—			18,356
Net Income	$	171,390		$	162,563		$	338,971		$	315,877
Third-Party Investors' Share of Net Income	$	88,217		$	94,949		$	177,530		$	178,715
Our Share of Net Income		83,173			67,614			161,441			137,162
Amortization of Excess Investment		(24,383	)		(24,853	)		(49,981	)		(49,682	)
Our Share of Income from Unconsolidated Discontinued Operations		(307	)		(206	)		(652	)		(499	)
Income from Unconsolidated Entities	$	58,483		$	42,555		$	110,808		$	86,981
Our share of income from unconsolidated entities in the above table, aggregated with our share of the results of Klépierre, is presented in income from unconsolidated entities in the accompanying consolidated statements of operations and comprehensive income.

Debt

Debt	6 Months Ended
	Jun. 30, 2014
Debt	'
Debt	'
	6. Debt
	Unsecured Debt
	At June 30, 2014, our unsecured debt consisted of $14.4 billion of senior unsecured notes of the Operating Partnership, net of discounts, $652.2 million outstanding under the Operating Partnership's $4.0 billion unsecured revolving credit facility, or Credit Facility, $219.5 million outstanding under the Operating Partnership's $2.0 billion supplemental unsecured revolving credit facility, or Supplemental Facility, and $240.0 million outstanding under an unsecured term loan. At June 30, 2014, the Credit Facility had a capacity of $4.0 billion including a $2.0 billion multi-currency tranche, an initial maturity of June 30, 2018, an interest rate of LIBOR plus 80 basis points and an additional facility fee of 10 basis points. In addition, the Credit Facility provides for a money-market competitive bid option program that allows us to hold auctions to achieve lower pricing for short term borrowings. The entire balance on the Credit Facility at June 30, 2014 consisted of Euro-denominated borrowings and the entire balance on the Supplemental Facility on such date consisted of Yen-denominated borrowings, both of which are designated as net investment hedges of our international investments.
	On June 30, 2014, we had an aggregate available borrowing capacity of $5.1 billion under the two credit facilities. The maximum outstanding balance of the credit facilities during the six months ended June 30, 2014 was $1.2 billion and the weighted average outstanding balance was $923.0 million. Letters of credit of $41.8 million were outstanding under the two credit facilities as of June 30, 2014.
	On April 7, 2014, the Operating Partnership amended and extended the Credit Facility. The initial borrowing capacity of $4.0 billion may now be increased to $5.0 billion during its term and provides for borrowings denominated in U.S. Dollars, Euros, Yen, Sterling, Canadian Dollars and Australian Dollars. Borrowings in currencies other than the U.S. Dollar are limited to 75% of the maximum revolving credit amount, as defined. The initial maturity date was extended to June 30, 2018 and can be extended for an additional year at our sole option to a final maturity date of June 30, 2019. The base interest rate on the amended Credit Facility was reduced to LIBOR plus 80 basis points and the additional facility fee was reduced to 10 basis points.
	The Supplemental Facility's borrowing capacity of $2.0 billion may be increased to $2.5 billion during its term. The Supplemental Facility will initially mature on June 30, 2016 and can be extended for an additional year at our sole option. As of June 30, 2014, the base interest rate on the Supplemental Facility was LIBOR plus 95 basis points with an additional facility fee of 15 basis points. Like the Credit Facility, the Supplemental Facility provides for a money market competitive bid option program and allows for multi-currency borrowings.
	On January 21, 2014, the Operating Partnership issued $600.0 million of senior unsecured notes at a fixed interest rate of 2.20% with a maturity date of February 1, 2019 and $600.0 million of senior unsecured notes at a fixed interest rate of 3.75% with a maturity date of February 1, 2024. Proceeds from the unsecured notes offering were used to repay debt and for general corporate purposes.
	During the six months ended June 30, 2014, we used cash on hand to redeem at par or repay at maturity $716.1 million of senior unsecured notes with fixed rates ranging from 4.90% to 6.75%.
	Mortgage Debt
	Total mortgage indebtedness was $6.3 billion and $7.3 billion at June 30, 2014 and December 31, 2013, respectively.
	On January 2, 2014, we repaid the $820.0 million outstanding mortgage at Sawgrass Mills originally maturing July 1, 2014 and on February 28, 2014, we repaid the $269.0 million outstanding mortgage at Great Mall originally maturing August 28, 2015.
	Covenants
	Our unsecured debt agreements contain financial and other covenants. If we were to fail to comply with these covenants, after the expiration of the applicable cure periods, the debt maturity could be accelerated or other remedies could be sought by the lender including adjustments to the applicable interest rate. As of June 30, 2014, we were in compliance with all covenants of our unsecured debt.
	At June 30, 2014, we or our subsidiaries are the borrowers under 42 non-recourse mortgage notes secured by mortgages on 56 properties, including five separate pools of cross-defaulted and cross-collateralized mortgages encumbering a total of 21 properties. Under these cross-default provisions, a default under any mortgage included in the cross-defaulted pool may constitute a default under all mortgages within that pool and may lead to acceleration of the indebtedness due on each property within the pool. Certain of our secured debt instruments contain financial and other non-financial covenants which are specific to the properties which serve as collateral for that debt. If the borrower fails to comply with these covenants, the lender could accelerate the debt and enforce its right against their collateral. At June 30, 2014, the applicable borrowers under these non-recourse mortgage notes were in compliance with all covenants where non-compliance could individually, or giving effect to applicable cross-default provisions in the aggregate, have a material adverse effect on our financial condition, results of operations or cash flows.
	Fair Value of Debt
	The carrying value of our variable-rate mortgages and other loans approximates their fair values. We estimate the fair values of consolidated fixed-rate mortgages using cash flows discounted at current borrowing rates and other indebtedness using cash flows discounted at current market rates. We estimate the fair values of consolidated fixed-rate unsecured notes using quoted market prices, or, if no quoted market prices are available, we use quoted market prices for securities with similar terms and maturities. The book value of our consolidated fixed-rate mortgages and unsecured indebtedness was $20.2 billion and $20.9 billion as of June 30, 2014 and December 31, 2013, respectively. The fair values of these financial instruments and the related discount rate assumptions as of June 30, 2014 and December 31, 2013 are summarized as follows:
		June 30,	December 31,
		2014	2013
	Fair value of fixed-rate mortgages and unsecured indebtedness	$21,781	$22,316
	Weighted average discount rates assumed in calculation of fair value for fixed-rate mortgages	3.24%	3.07%

Equity

Equity	6 Months Ended
	Jun. 30, 2014
Equity	'
Equity	'
	7. Equity
	During the six months ended June 30, 2014, we issued 63,629 shares of common stock to four limited partners of the Operating Partnership in exchange for an equal number of units pursuant to the partnership agreement of the Operating Partnership.
	On January 30, 2014, the Operating Partnership issued 555,150 units in connection with the acquisition of the remaining 50% interest in Arizona Mills and approximately 39 acres of land in Oyster Bay, New York, as discussed in Note 9.
	Stock Based Compensation
	Awards under our stock based compensation plans primarily take the form of LTIP units and restricted stock grants made under The Simon Property Group, L.P. 1998 Stock Incentive Plan, or the Plan. Restricted stock and awards under the LTIP programs are all performance based and are based on various corporate and business unit performance measures as further described below. The expense related to these programs, net of amounts capitalized, is included within home and regional office costs and general and administrative costs in the accompanying consolidated statements of operations and comprehensive income.
	LTIP Programs.    Every year since 2010, the Compensation Committee of the Board of Directors, or Compensation Committee, has approved long-term, performance based incentive compensation programs, or the LTIP programs, for certain senior executive officers. Awards under the LTIP programs take the form of LTIP units, a form of limited partnership interest issued by the Operating Partnership, and will be considered earned if, and only to the extent to which, applicable total shareholder return, or TSR, performance measures are achieved during the performance period. Once earned, LTIP units are subject to a two year vesting period. One-half of the earned LTIP units will vest on January 1 of each of the 2nd and 3rd years following the end of the applicable performance period, subject to the participant maintaining employment with us through those dates and certain other conditions as described in those agreements. Awarded LTIP units not earned are forfeited. Earned and fully vested LTIP units are the equivalent of units. During the performance period, participants are entitled to receive distributions on the LTIP units awarded to them equal to 10% of the regular quarterly distributions paid on a unit of the Operating Partnership. As a result, we account for these LTIP units as participating securities under the two-class method of computing earnings per share.
	From 2010 to 2014, the Compensation Committee approved LTIP grants as shown in the table below. Grant date fair values of the LTIP units are estimated using a Monte Carlo model, and the resulting expense is recorded regardless of whether the TSR performance measures are achieved if the required service is delivered. The grant date fair values are being amortized into expense over the period from the grant date to the date at which the awards, if any, would become vested. The extent to which LTIP units that were earned and the aggregate grant date fair values adjusted for estimated forfeitures, are as set forth as follows:
	LTIP Program	LTIP Units Earned		Grant Date Fair Value
	2010 LTIP Program
	1-year 2010 LTIP Program	133,673		1-year program — $7.2 million
	2-year 2010 LTIP Program	337,006		2-year program — $14.8 million
	3-year 2010 LTIP Program	489,654		3-year program — $23.0 million
	2011-2013 LTIP Program	469,848		$35.0 million
	2012-2014 LTIP Program	To be determined in 2015		$35.0 million
	2013-2015 LTIP Program	To be determined in 2016		$33.5 million
	2014-2016 LTIP Program	To be determined in 2017		$30.0 million
	We recorded compensation expense, net of capitalization, related to these LTIP programs of approximately $13.6 million and $12.6 million for the six months ended June 30, 2014 and 2013, respectively.
	Restricted Stock.    The Compensation Committee awarded 1,246 and 62,565 shares of restricted stock to employees on February 26, 2014 and April 1, 2014, respectively, under the Plan, at a fair market value of $161.06 per share and $164.92 per share, respectively. On May 27, 2014, our non-employee Directors were awarded 3,570 shares of restricted stock under the Plan at a fair market value of $176.55 per share. The fair market value of the employee restricted stock awards is being recognized as expense over the three-year vesting service period. The fair market value of the Director restricted stock awards is being recognized as expense over the one-year vesting service period.
	We recorded compensation expense, net of capitalization, related to restricted stock of approximately $7.1 million and $6.9 million for the six months ended June 30, 2014 and 2013, respectively.
	Other Compensation Arrangements.    On July 6, 2011, in connection with the execution of an eight year employment agreement, the Compensation Committee granted David Simon, our Chairman and CEO, a retention award in the form of 1,000,000 LTIP units (the "Award") for his continued service as our Chairman and Chief Executive Officer through July 5, 2019. Effective December 31, 2013, the Award was modified ("Current Award") and as a result the LTIP units will now become earned and eligible to vest based on the attainment of Company-based performance goals, in addition to the service-based vesting requirement included in the original Award. If the relevant performance criteria are not achieved, all or a portion of the Current Award will be forfeited. The Current Award does not contain an opportunity for Mr. Simon to receive additional LTIP Units above and beyond the original Award should our performance exceed the higher end of the performance criteria. The performance criteria of the Current Award are based on the attainment of specific funds from operations ("FFO") per share. If the performance criteria have been met, a maximum of 360,000 LTIP units ("A Units"), 360,000 LTIP units ("B Units") and 280,000 LTIP units ("C Units") may become earned December 31, 2015, 2016 and 2017, respectively. The earned A Units will vest on January 1, 2018, earned B Units will vest on January 1, 2019 and earned C Units will vest on June 30, 2019, subject to Mr. Simon's continued employment through such applicable date. The grant date fair value of the retention award of $120.3 million is being recognized as expense over the eight-year term of his employment agreement on a straight-line basis based through the applicable vesting periods of the A Units, B Units and C Units.
	Changes in Equity
	The following table provides a reconciliation of the beginning and ending carrying amounts of total equity, equity attributable to common stockholders and equity attributable to noncontrolling interests:
		Preferred			Common		Accumulated			Capital in			Accumulated			Common Stock			Noncontrolling			Total
		Stock			Stock		Other			Excess of			Deficit			Held in			interests			Equity
							Comprehensive			Par Value						Treasury
							Income (Loss)
	January 1, 2014	$	44,390		$	31	$	(75,795	)	$	9,217,363		$	(3,218,686	)	$	(117,897	)	$	973,226		$	6,822,632
	Exchange of limited partner units for common shares										1,190									(1,190	)		—
	Issuance of limited partner units																			84,910			84,910
	Spin-off of Washington Prime													(812,763	)								(812,763	)
	Long-term incentive performance units																			24,969			24,969
	Purchase and disposition of noncontrolling interests, net and other		(164	)							(663	)		26,358			11,149			10,729			47,409
	Adjustment to limited partners' interest from change in ownership in the Operating Partnership										188,680									(188,680	)		—
	Distributions to common stockholders and limited partners, excluding Operating Partnership preferred interests													(793,892	)					(133,858	)		(927,750	)
	Distributions to other noncontrolling interest partners																			(17,607	)		(17,607	)
	Comprehensive income, excluding $957 attributable to preferred interests in the Operating Partnership							14,059						749,904						129,845			893,808
	June 30, 2014	$	44,226		$	31	$	(61,736	)	$	9,406,570		$	(4,049,079	)	$	(106,748	)	$	882,344		$	6,115,608

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2014
Commitments and Contingencies.	'
Commitments and Contingencies	'
	8. Commitments and Contingencies
	Litigation
	We are involved from time-to-time in various legal proceedings that arise in the ordinary course of our business, including, but not limited to commercial disputes, environmental matters, and litigation in connection with transactions including acquisitions and divestitures. We believe that such litigation, claims and administrative proceedings will not have a material adverse impact on our financial position or our results of operations. We record a liability when a loss is considered probable and the amount can be reasonably estimated.
	In May 2010, Opry Mills sustained significant flood damage. Insurance proceeds of $50 million have been funded by the insurers, remediation work has been completed. The property was re-opened March 29, 2012. The excess insurance carriers (those providing coverage above $50 million) have denied our claim under the policy for additional proceeds (of up to $150 million) to pay further amounts for restoration costs and business interruption losses. We and our lenders are continuing our efforts through pending litigation to recover our losses under the excess insurance policies for Opry Mills and we believe recovery is probable, but no assurances can be made that our efforts to recover these funds will be successful.
	Guarantees of Indebtedness
	Joint venture debt is the liability of the joint venture and is typically secured by the joint venture property, which is non-recourse to us. As of June 30, 2014 and December 31, 2013, the Operating Partnership guaranteed joint venture related mortgage indebtedness of $229.1 million and $190.8 million, respectively (of which we have a right of recovery from our venture partners of $90.3 million and $83.0 million, respectively). Mortgages guaranteed by us are secured by the property of the joint venture which could be sold in order to satisfy the outstanding obligation and which has an estimated fair value in excess of the guaranteed amount.
	Concentration of Credit Risk
	Our U.S. Malls, Premium Outlets, and The Mills rely heavily upon anchor tenants to attract customers; however anchor retailers do not contribute materially to our financial results as many anchor retailers own their spaces. All material operations are within the United States and no customer or tenant accounts for 5% or more of our consolidated revenues.

Real_Estate_Acquisitions_and_D

Real Estate Acquisitions and Dispositions	6 Months Ended
	Jun. 30, 2014
Real Estate Acquisitions and Dispositions	'
Real Estate Acquisitions and Dispositions	'
	9. Real Estate Acquisitions and Dispositions
	On April 10, 2014, as discussed further in Note 5, we acquired an additional noncontrolling interest in Ashford Designer Outlet.
	On January 30, 2014, we acquired the remaining 50% interest in Arizona Mills from our joint venture partner, as well as approximately 39 acres of land in Oyster Bay, New York, for approximately $145.8 million, consisting of cash consideration and 555,150 units of the Operating Partnership. Arizona Mills is subject to a mortgage which was $166.9 million at the time of the acquisition. The consolidation of this previously unconsolidated property resulted in a remeasurement of our previously held interest to fair value and a corresponding non-cash gain of $2.7 million in the first quarter of 2014. We now own 100% of this property.
	On January 10, 2014, we acquired one of our partner's redeemable interests in a portfolio of ten properties for approximately $114.4 million subject to a pre-existing contractual arrangement. The amount paid to acquire the interests in the seven properties which were previously consolidated was included in limited partners' preferred interest in the Operating Partnership and noncontrolling redeemable interests in properties at December 31, 2013.
	During the first quarter of 2013, we acquired rights to the remaining interests in three unconsolidated community centers and subsequently disposed our interests in those properties. Additionally, we disposed of our interest in another community center. The aggregate gain recognized on these transactions was approximately $20.8 million. Of this gain, $14.2 million is included within discontinued operations.
	During 2013, as further discussed in Note 5, we acquired noncontrolling interests in the property management and development companies of McArthurGlen as well as interests in five designer outlet properties.
	On May 30, 2013 we acquired a 100% interest in a 390,000 square foot outlet center located near Portland, Oregon for cash consideration of $146.7 million. The fair value of the acquisition was recorded primarily as investment property and lease related intangibles. As a result of the excess of fair value over amounts paid, we recognized a gain of approximately $27.3 million.
	Unless otherwise noted, gains and losses on the above transactions are included in gain upon acquisition of controlling interests and sale or disposal of assets and interests in unconsolidated entities, net in the accompanying consolidated statements of operations and comprehensive income.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2014
Significant Accounting Policies	'
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	We consider all highly liquid investments purchased with an original maturity of 90 days or less to be cash and cash equivalents. Cash equivalents are carried at cost, which approximates fair value. Cash equivalents generally consist of commercial paper, bankers' acceptances, Eurodollars, repurchase agreements, and money market deposits or securities. Financial instruments that potentially subject us to concentrations of credit risk include our cash and cash equivalents and our trade accounts receivable. We place our cash and cash equivalents with institutions with high credit quality. However, at certain times, such cash and cash equivalents are in excess of FDIC and SIPC insurance limits.
Marketable and Non-Marketable Securities	'
	Marketable and Non-Marketable Securities
	Marketable securities consist primarily of the investments of our captive insurance subsidiaries, available-for-sale securities, our deferred compensation plan investments, and certain investments held to fund the debt service requirements of debt previously secured by investment properties.
	The types of securities included in the investment portfolio of our captive insurance subsidiaries typically include U.S. Treasury or other U.S. government securities as well as corporate debt securities with maturities ranging from less than 1 to 10 years. These securities are classified as available-for-sale and are valued based upon quoted market prices or other observable inputs when quoted market prices are not available. The amortized cost of debt securities, which approximates fair value, held by our captive insurance subsidiaries is adjusted for amortization of premiums and accretion of discounts to maturity. Changes in the values of these securities are recognized in accumulated other comprehensive income (loss) until the gain or loss is realized or until any unrealized loss is deemed to be other-than-temporary. We review any declines in value of these securities for other-than-temporary impairment and consider the severity and duration of any decline in value. To the extent an other-than-temporary impairment is deemed to have occurred, an impairment charge is recorded and a new cost basis is established. Subsequent changes are then recognized through other comprehensive income (loss) unless another other-than-temporary impairment is deemed to have occurred. Net unrealized gains recorded in other comprehensive income (loss) as of June 30, 2014 and December 31, 2013 were approximately $1.8 million and $1.1 million, respectively, and represent the valuation and related currency adjustments for our marketable securities.
	Our insurance subsidiaries are required to maintain statutory minimum capital and surplus as well as maintain a minimum liquidity ratio. Therefore, our access to these securities may be limited. Our deferred compensation plan investments are classified as trading securities and are valued based upon quoted market prices. The investments have a matching liability as the amounts are fully payable to the employees that earned the compensation. Changes in value of these securities and changes to the matching liability to employees are both recognized in earnings and, as a result, there is no impact to consolidated net income.
	At June 30, 2014 and December 31, 2013, we had investments of $118.8 million in non-marketable securities that we account for under the cost method. We regularly evaluate these investments for any other-than-temporary impairment in their estimated fair value and determined that no adjustment in the carrying value was required.
Fair Value Measurements	'
	Fair Value Measurements
	Level 1 fair value inputs are quoted prices for identical items in active, liquid and visible markets such as stock exchanges. Level 2 fair value inputs are observable information for similar items in active or inactive markets, and appropriately consider counterparty creditworthiness in the valuations. Level 3 fair value inputs reflect our best estimate of inputs and assumptions market participants would use in pricing an asset or liability at the measurement date. The inputs are unobservable in the market and significant to the valuation estimate. We have no investments for which fair value is measured on a recurring basis using Level 3 inputs.
	We held marketable securities that totaled $159.7 million and $148.3 million at June 30, 2014 and December 31, 2013, respectively, that were primarily classified as having Level 1 fair value inputs. In addition, we have derivative instruments which are classified as having Level 2 inputs which consist primarily of interest rate swap agreements and foreign currency forward contracts with a gross liability balance of $0.1 million and $1.2 million at June 30, 2014 and December 31, 2013, respectively, and a gross asset value of $0.3 million and $8.4 million at June 30, 2014 and December 31, 2013, respectively. We also have interest rate cap agreements with nominal values.
	Note 6 includes a discussion of the fair value of debt measured using Level 2 inputs. Notes 5 and 9 include discussion of the fair values recorded in purchase accounting and impairment, using Level 2 and Level 3 inputs. Level 3 inputs to our purchase accounting and impairment include our estimations of net operating results of the property, capitalization rates and discount rates.
Noncontrolling Interests	'
	Noncontrolling Interests
	Details of the carrying amount of our noncontrolling interests are as follows:
		As of			As of
		June 30,			December 31,
		2014			2013
	Limited partners' interests in the Operating Partnership	$	883,987		$	968,962
	Nonredeemable noncontrolling (deficit) interests in properties, net		(1,643	)		4,264
	Total noncontrolling interests reflected in equity	$	882,344		$	973,226
	Net income attributable to noncontrolling interests (which includes nonredeemable noncontrolling interests in consolidated properties, limited partners' interests in the Operating Partnership, redeemable noncontrolling interests in consolidated properties and preferred distributions payable by the Operating Partnership on its outstanding preferred units) is a component of consolidated net income. In addition, the individual components of other comprehensive income (loss) are presented in the aggregate for both controlling and noncontrolling interests, with the portion attributable to noncontrolling interests deducted from comprehensive income attributable to common stockholders.
	A rollforward of noncontrolling interests reflected in equity is as follows:
		For the Three						For the Six
		Months Ended						Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
	Noncontrolling interests, beginning of period	$	989,988		$	977,753		$	973,226		$	982,486
	Net income attributable to noncontrolling interests after preferred distributions and income attributable to redeemable noncontrolling interests in consolidated properties		70,060			57,202			127,710			104,761
	Distributions to noncontrolling interest holders		(74,029	)		(60,082	)		(151,465	)		(119,907	)
	Other comprehensive income (loss) allocable to noncontrolling interests:
	Unrealized (loss) gain on derivative hedge agreements		(17	)		(219	)		(1,253	)		740
	Net loss reclassified from accumulated other comprehensive loss into earnings		376			368			768			586
	Currency translation adjustments		586			(3,285	)		2,518			(3,158	)
	Changes in available-for-sale securities and other		30			(92	)		102			(117	)
			975			(3,228	)		2,135			(1,949	)
	Adjustment to limited partners' interest from change in ownership in the Operating Partnership		(121,454	)		(7,934	)		(188,680	)		(10,581	)
	Units issued to limited partners		—			—			84,910			—
	Units exchanged for common shares		(279	)		(3,461	)		(1,190	)		(5,982	)
	Long-term incentive performance units		12,484			11,248			24,969			22,670
	Purchase and disposition of noncontrolling interests, net, and other		4,599			—			10,729			—
	Noncontrolling interests, end of period	$	882,344		$	971,498		$	882,344		$	971,498
Temporary Equity	'
	Temporary Equity
	The remaining interests in a property or portfolio of properties which are redeemable at the option of the holder or in circumstances that may be outside our control, are accounted for as temporary equity within limited partners' preferred interest in the Operating Partnership and noncontrolling redeemable interests in properties in the accompanying consolidated balance sheets. The carrying amount of each noncontrolling interest is adjusted to the redemption amount assuming the interest is redeemable at the balance sheet date.
	As discussed in Note 9, on January 10, 2014, we acquired one of our partner's redeemable interests in a portfolio of properties. During the three months ended June 30, 2014, in connection with the resolution of all partnership disputes with related party limited partners in one of our partnerships, we contributed $83.0 million into the partnership in exchange for a new series of preferred partnership units that carry a 2.5% preferred return. Amounts due upon a future exercise of the limited partners' right to cause us to redeem their noncontrolling interests would be net of this preferred investment. Accordingly, this preferred investment contractually offsets the mezzanine liability previously recognized on the accompanying consolidated balance sheet.
	Changes in the redemption value of the underlying noncontrolling interest are recorded within accumulated deficit. If and to the extent the value of the redemption right exceeds the fair value of the limited partners' interests in the partnership, earnings will be charged. There are no noncontrolling interests redeemable at amounts in excess of fair value at June 30, 2014.
Accumulated Other Comprehensive Income (Loss)	'
	Accumulated Other Comprehensive Income (Loss)
	The changes in accumulated other comprehensive income (loss) net of noncontrolling interest by component consisted of the following as of June 30, 2014:
		Currency			Accumulated			Net unrealized			Total
		translation			derivative			gains on
		adjustments			losses, net			marketable
								securities
	Beginning balance	$	(23,781	)	$	(52,985	)	$	971		$	(75,795	)
	Other comprehensive income (loss) before reclassifications		15,261			(6,288	)		580			9,553
	Amounts reclassified from accumulated other comprehensive income (loss)		—			4,506			—			4,506
	Net current-period other comprehensive income (loss)		15,261			(1,782	)		580			14,059
	Ending balance	$	(8,520	)	$	(54,767	)	$	1,551		$	(61,736	)
	The reclassifications out of accumulated other comprehensive income (loss) consisted of the following as of June 30, 2014 and 2013:
		June 30, 2014			June 30, 2013
	Details about	Amount reclassified from			Amount reclassified from			Affected line item in the statement where net
	accumulated other	accumulated other			accumulated other			income is presented
	comprehensive income	comprehensive income (loss)			comprehensive income (loss)
	(loss) components:
	Accumulated derivative losses, net	$	(5,274	)	$	(4,076	)	Interest expense
			768			586		Net income attributable to noncontrolling interests
		$	(4,506	)	$	(3,490	)
Derivative Financial Instruments	'
	Derivative Financial Instruments
	We record all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether we have designated a derivative as a hedge and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. We may use a variety of derivative financial instruments in the normal course of business to selectively manage or hedge a portion of the risks associated with our indebtedness and interest payments. Our objectives in using interest rate derivatives are to add stability to interest expense and to manage our exposure to interest rate movements. To accomplish this objective, we primarily use interest rate swaps and caps. We require that hedging derivative instruments be highly effective in reducing the risk exposure that they are designated to hedge. As a result, there is no significant ineffectiveness from any of our derivative activities. We formally designate any instrument that meets these hedging criteria as a hedge at the inception of the derivative contract. We have no credit-risk-related hedging or derivative activities.
	As of June 30, 2014, we had no outstanding interest rate derivatives. The carrying value of our interest rate swap agreements, at fair value, as of December 31, 2013, was a net asset balance of $3.0 million, of which $0.4 million was included in other liabilities and $3.4 million was included in deferred costs and other assets. The interest rate caps were of nominal value at December 31, 2013 and we generally do not apply hedge accounting to these arrangements.
	We are also exposed to fluctuations in foreign exchange rates on financial instruments which are denominated in foreign currencies, primarily in Japan and Europe. We use currency forward contracts and foreign currency denominated debt to manage our exposure to changes in foreign exchange rates on certain Yen and Euro-denominated receivables and net investments. Currency forward contracts involve fixing the Yen:USD or Euro:USD exchange rate for delivery of a specified amount of foreign currency on a specified date. The currency forward contracts are typically cash settled in US dollars for their fair value at or close to their settlement date. Approximately ¥1.5 billion remains as of June 30, 2014 for all forward contracts that we expect to receive through January 5, 2015. The June 30, 2014 carrying value was a net $0.2 million, of which $0.3 million is included in deferred costs and other assets and $0.1 million is included in other liabilities. We have reported the changes in fair value for these forward contracts in earnings. The underlying currency adjustments on the foreign currency denominated receivables are also reported in income and generally offset the amounts in earnings for these forward contracts.
	In the fourth quarter of 2013, we entered into a Euro:USD forward contract with a €74.0 million notional value, which we designated as a net investment hedge, that matured on May 30, 2014. The liability balance related to this forward contract was $0.8 million and included in other liabilities as of December 31, 2013. We applied hedge accounting to this forward contract and reported the change in fair value in other comprehensive income (loss). Changes in the value of this forward contract are offset by changes in the underlying hedged Euro-denominated joint venture investment.
	The total gross accumulated other comprehensive loss related to our derivative activities, including our share of the other comprehensive loss from joint venture properties, approximated $64.1 million and $61.8 million as of June 30, 2014 and December 31, 2013, respectively.
New Accounting Pronouncements	'
	New Accounting Pronouncements
	In April 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity." ASU No. 2014-08 changes the definition of a discontinued operation to include only those disposals of components of an entity that represent a strategic shift that has (or will have) a major effect on an entity's operations and financial results. ASU No. 2014-08 is effective prospectively for fiscal years beginning after December 15, 2014, but can be early-adopted. We early adopted ASU No. 2014-08 and are applying the revised definition to all disposals on a prospective basis, including the spin-off of Washington Prime as further discussed below. ASU 2014-08 also requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation.
	In May 2014, the FASB issued ASU 2014-09, "Revenue From Contracts With Customers." ASU 2014-09 amends the existing accounting standards for revenue recognition and is based on principles that govern the recognition of revenue at an amount an entity expects to be entitled when products are transferred to customers. ASU 2014-09 will be effective for us beginning in its first quarter of 2017. Early adoption is not permitted. The new revenue standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of adoption. We are currently evaluating the impact of adopting the new revenue standard on our consolidated financial statements.
Transaction Expenses	'
	Transaction Expenses
	We expense acquisition, potential acquisition and disposition related costs as they are incurred. We incurred $38.2 million in transaction costs during the first six months of 2014 related to the spin-off of Washington Prime. Other than these transaction costs, we incurred a minimal amount of transaction expenses during the six months ended June 30, 2014 and 2013.
Discontinued Operations	'
	Discontinued Operations
	On May 28, 2014, we completed the spin-off of our interests in 98 properties comprised of substantially all of our strip center business and our smaller enclosed malls to Washington Prime, an independent, publicly traded REIT. The spin-off was effectuated through a distribution of the common shares of Washington Prime to holders of Simon common stock as of the distribution record date, and qualified as a tax-free distribution for U.S. federal income tax purposes. For every two shares of Simon common stock held as of the record date of May 16, 2014, Simon stockholders received one Washington Prime common share on May 28, 2014. At the time of the separation and distribution, Washington Prime owned a percentage of the outstanding units of partnership interest of Washington Prime Group, L.P. that was approximately equal to the percentage of outstanding units of partnership interest of the Operating Partnership, or units, owned by us. The remaining units of Washington Prime Group, L.P. were owned by limited partners of the Operating Partnership who received one Washington Prime Group, L.P. unit for every two units they owned in the Operating Partnership. Subsequent to the spin-off, we retained a nominal interest in Washington Prime Group, L.P. We also retained approximately $1.0 billion of proceeds from recently completed unsecured debt and mortgage debt as part of the spin-off.
	The historical results of operations of the Washington Prime properties have been presented as discontinued operations in the consolidated statements of operations and comprehensive income. Discontinued operations also include transaction costs of $38.2 million we incurred to spin-off Washington Prime. In addition, the assets and liabilities of Washington Prime are presented separately from assets and liabilities from continuing operations in the accompanying consolidated balance sheets. The accompanying consolidated statement of cash flows includes within operating, investing and financing cash flows those activities which related to our period of ownership of the Washington Prime properties.
	The following is a summary of the assets and liabilities transferred to Washington Prime as part of the spin-off (dollars in millions):
		May 28,			December 31,
		2014			2013
	ASSETS:
	Investment properties at cost	$	4,802,975		$	4,789,705
	Less — accumulated depreciation		2,034,615			1,974,949
			2,768,360			2,814,756
	Cash and cash equivalents		33,776			25,857
	Tenant receivables and accrued revenue, net		53,662			61,121
	Investment in unconsolidated entities, at equity		5,189			3,554
	Deferred costs and other assets		110,365			97,026
	Total assets	$	2,971,352		$	3,002,314
	LIABILITIES:
	Mortgages and unsecured indebtedness	$	1,929,019		$	918,614
	Accounts payable, accrued expenses, intangibles, and deferred revenues		112,390			151,011
	Cash distributions and losses in partnerships and joint ventures, at equity		41,623			41,313
	Other liabilities		36,927			6,851
	Total liabilities		2,119,959			1,117,789
	Net Assets Transferred to Washington Prime	$	851,393		$	1,884,525
	The results of the discontinued operations through the May 28, 2014 date of the spin-off are included in the consolidated results for the three and six months ended June 30, 2014. Summarized financial information for discontinued operations for the three and six month periods ended June 30, 2014 and 2013 is as follows (dollars in millions).
		Three Months ended						Six Months ended
		June 30,						June 30,
		2014			2013			2014			2013
	TOTAL REVENUE	$	104,683		$	151,570		$	262,652		$	305,805
	Property operating		17,035			25,455			43,175			49,820
	Depreciation and amortization		31,024			45,101			76,992			90,400
	Real estate taxes		12,526			18,395			32,474			38,357
	Repairs and maintenance		3,181			5,503			10,331			10,889
	Advertising and promotion		1,388			1,808			3,340			3,945
	Provision for (recovery of) credit losses		708			(806	)		1,494			(116	)
	Other		910			1,163			2,028			2,354
	Total operating expenses		66,772			96,619			169,834			195,649
	OPERATING INCOME		37,911			54,951			92,818			110,156
	Interest expense		(12,159	)		(13,737	)		(26,076	)		(27,456	)
	Income and other taxes		(37	)		(24	)		(112	)		(102	)
	Income from unconsolidated entities		307			206			652			499
	Gain upon acquisition of controlling interests and sale or disposal of assets and interests in unconsolidated entities, net		—			—			242			14,152
	CONSOLIDATED NET INCOME		26,022			41,396			67,524			97,249
	Net income attributable to noncontrolling interests		3,792			5,963			9,781			13,995
	NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	$	22,230		$	35,433		$	57,743		$	83,254
	Capital expenditures on a cash basis (in millions) for the three month periods ended June 30, 2014 and 2013 were $7.1 and $18.3, respectively, and for the six month periods ended June 30, 2014 and 2013 were $31.9 and $42.5, respectively.
	We and Washington Prime entered into property management and transitional services agreements in connection with the spin-off whereby we will provide certain services to Washington Prime and its properties. Pursuant to the terms of the property management agreements, we will manage, lease, and maintain Washington Prime's mall properties under the direction of Washington Prime. In exchange, Washington Prime will pay us annual fixed rate property management fees ranging from 2.5% to 4.0% of base minimum and percentage rents, will reimburse us for direct out-of-pocket costs and expenses and will also pay us separate fees for leasing and development services provided by us. The property management agreements have an initial term of two years with automatic one year renewals unless terminated. Either party may terminate the property management agreement on or after the two-year anniversary of the spin-off upon 180 days prior written notice.
	We will also provide certain support services to the Washington Prime strip centers and certain of its central functions that will enable Washington Prime to establish its stand-alone processes for various activities that were previously provided by us and does not constitute significant continuing support of Washington Prime's operations. These services include assistance in the areas of information technology, treasury and financial management, payroll, lease administration, taxation and procurement. The charges for such services are intended to allow us to recover the costs of providing these services. The transition services agreement will terminate no later than two years following the date of the spin-off subject to a minimum notice period equal to the shorter of 180 days or one-half of the original service period.
	Management and transitional services fees earned for the three and six month periods ended June 30, 2014 were not significant.

Significant_Accounting_Policie2

Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2014
Significant Accounting Policies	'
Schedule of carrying amount of noncontrolling interests	'
		As of			As of
		June 30,			December 31,
		2014			2013
	Limited partners' interests in the Operating Partnership	$	883,987		$	968,962
	Nonredeemable noncontrolling (deficit) interests in properties, net		(1,643	)		4,264
	Total noncontrolling interests reflected in equity	$	882,344		$	973,226
Schedule of rollforward of noncontrolling interests	'
		For the Three						For the Six
		Months Ended						Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
	Noncontrolling interests, beginning of period	$	989,988		$	977,753		$	973,226		$	982,486
	Net income attributable to noncontrolling interests after preferred distributions and income attributable to redeemable noncontrolling interests in consolidated properties		70,060			57,202			127,710			104,761
	Distributions to noncontrolling interest holders		(74,029	)		(60,082	)		(151,465	)		(119,907	)
	Other comprehensive income (loss) allocable to noncontrolling interests:
	Unrealized (loss) gain on derivative hedge agreements		(17	)		(219	)		(1,253	)		740
	Net loss reclassified from accumulated other comprehensive loss into earnings		376			368			768			586
	Currency translation adjustments		586			(3,285	)		2,518			(3,158	)
	Changes in available-for-sale securities and other		30			(92	)		102			(117	)
			975			(3,228	)		2,135			(1,949	)
	Adjustment to limited partners' interest from change in ownership in the Operating Partnership		(121,454	)		(7,934	)		(188,680	)		(10,581	)
	Units issued to limited partners		—			—			84,910			—
	Units exchanged for common shares		(279	)		(3,461	)		(1,190	)		(5,982	)
	Long-term incentive performance units		12,484			11,248			24,969			22,670
	Purchase and disposition of noncontrolling interests, net, and other		4,599			—			10,729			—
	Noncontrolling interests, end of period	$	882,344		$	971,498		$	882,344		$	971,498
Schedule of changes in components of accumulated other comprehensive income (loss) net of noncontrolling interest	'
	The changes in accumulated other comprehensive income (loss) net of noncontrolling interest by component consisted of the following as of June 30, 2014:
		Currency			Accumulated			Net unrealized			Total
		translation			derivative			gains on
		adjustments			losses, net			marketable
								securities
	Beginning balance	$	(23,781	)	$	(52,985	)	$	971		$	(75,795	)
	Other comprehensive income (loss) before reclassifications		15,261			(6,288	)		580			9,553
	Amounts reclassified from accumulated other comprehensive income (loss)		—			4,506			—			4,506
	Net current-period other comprehensive income (loss)		15,261			(1,782	)		580			14,059
	Ending balance	$	(8,520	)	$	(54,767	)	$	1,551		$	(61,736	)
Schedule of reclassifications out of accumulated other comprehensive income (loss)	'
		June 30, 2014			June 30, 2013
	Details about	Amount reclassified from			Amount reclassified from			Affected line item in the statement where net
	accumulated other	accumulated other			accumulated other			income is presented
	comprehensive income	comprehensive income (loss)			comprehensive income (loss)
	(loss) components:
	Accumulated derivative losses, net	$	(5,274	)	$	(4,076	)	Interest expense
			768			586		Net income attributable to noncontrolling interests
		$	(4,506	)	$	(3,490	)
Summary of the assets and liabilities transferred to Washington Prime as part of the spin-off	'
	The following is a summary of the assets and liabilities transferred to Washington Prime as part of the spin-off (dollars in millions):
		May 28,			December 31,
		2014			2013
	ASSETS:
	Investment properties at cost	$	4,802,975		$	4,789,705
	Less — accumulated depreciation		2,034,615			1,974,949
			2,768,360			2,814,756
	Cash and cash equivalents		33,776			25,857
	Tenant receivables and accrued revenue, net		53,662			61,121
	Investment in unconsolidated entities, at equity		5,189			3,554
	Deferred costs and other assets		110,365			97,026
	Total assets	$	2,971,352		$	3,002,314
	LIABILITIES:
	Mortgages and unsecured indebtedness	$	1,929,019		$	918,614
	Accounts payable, accrued expenses, intangibles, and deferred revenues		112,390			151,011
	Cash distributions and losses in partnerships and joint ventures, at equity		41,623			41,313
	Other liabilities		36,927			6,851
	Total liabilities		2,119,959			1,117,789
	Net Assets Transferred to Washington Prime	$	851,393		$	1,884,525
Summarized financial information for discontinued operations	'
	Summarized financial information for discontinued operations for the three and six month periods ended June 30, 2014 and 2013 is as follows (dollars in millions).
		Three Months ended						Six Months ended
		June 30,						June 30,
		2014			2013			2014			2013
	TOTAL REVENUE	$	104,683		$	151,570		$	262,652		$	305,805
	Property operating		17,035			25,455			43,175			49,820
	Depreciation and amortization		31,024			45,101			76,992			90,400
	Real estate taxes		12,526			18,395			32,474			38,357
	Repairs and maintenance		3,181			5,503			10,331			10,889
	Advertising and promotion		1,388			1,808			3,340			3,945
	Provision for (recovery of) credit losses		708			(806	)		1,494			(116	)
	Other		910			1,163			2,028			2,354
	Total operating expenses		66,772			96,619			169,834			195,649
	OPERATING INCOME		37,911			54,951			92,818			110,156
	Interest expense		(12,159	)		(13,737	)		(26,076	)		(27,456	)
	Income and other taxes		(37	)		(24	)		(112	)		(102	)
	Income from unconsolidated entities		307			206			652			499
	Gain upon acquisition of controlling interests and sale or disposal of assets and interests in unconsolidated entities, net		—			—			242			14,152
	CONSOLIDATED NET INCOME		26,022			41,396			67,524			97,249
	Net income attributable to noncontrolling interests		3,792			5,963			9,781			13,995
	NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	$	22,230		$	35,433		$	57,743		$	83,254

Per_Share_Data_Tables

Per Share Data (Tables)	6 Months Ended
	Jun. 30, 2014
Per Share Data	'
Schedule of computation of basic and diluted earnings per share	'
		For the Three Months				For the Six Months
		Ended June 30,				Ended June 30,
		2014		2013		2014		2013
	Net Income attributable to Common Stockholders — Basic and Diluted	$	406,587	$	339,936	$	748,235	$	623,074
	Weighted Average Shares Outstanding — Basic		310,743,242		310,261,278		310,683,240		310,124,651
	Effect of stock options		—		—		—		103
	Weighted Average Shares Outstanding — Diluted		310,743,242		310,261,278		310,683,240		310,124,754

Investment_in_Unconsolidated_E1

Investment in Unconsolidated Entities (Tables)	6 Months Ended
	Jun. 30, 2014
Investment in Unconsolidated Entities	'
Summary of equity method investments and share of income from such investments, balance sheet	'
		June 30,			December 31,
		2014			2013
	Assets:
	Investment properties, at cost	$	15,842,291		$	15,355,700
	Less — accumulated depreciation		5,280,359			5,080,832
			10,561,932			10,274,868
	Cash and cash equivalents		756,563			781,554
	Tenant receivables and accrued revenue, net		304,679			302,902
	Investment in unconsolidated entities, at equity		28,517			38,352
	Deferred costs and other assets		589,390			579,480
	Total assets of discontinued operations		—			281,000
	Total assets	$	12,241,081		$	12,258,156
	Liabilities and Partners' Deficit:
	Mortgages	$	12,764,686		$	12,753,139
	Accounts payable, accrued expenses, intangibles, and deferred revenue		980,159			834,898
	Other liabilities		568,158			513,897
	Total liabilities of discontinued operations		—			286,252
	Total liabilities		14,313,003			14,388,186
	Preferred units		67,450			67,450
	Partners' deficit		(2,139,372	)		(2,197,480	)
	Total liabilities and partners' deficit	$	12,241,081		$	12,258,156
	Our Share of:
	Partners' deficit	$	(541,435	)	$	(717,776	)
	Add: Excess Investment		1,948,565			2,059,584
	Add: Our Share of investment in discontinued unconsolidated entities, at equity		—			37,759
	Our net investment in unconsolidated entities, at equity	$	1,407,130		$	1,379,567
Summary of equity method investments and share of income from such investments, statement of operations	'
		For the Three Months						For the Six Months
		Ended June 30,						Ended June 30,
		2014			2013			2014			2013
	Revenue:
	Minimum rent	$	427,899		$	387,600		$	852,684		$	769,072
	Overage rent		41,589			39,997			90,386			87,613
	Tenant reimbursements		193,006			182,799			385,799			362,393
	Other income		61,929			39,397			174,635			81,392
	Total revenue		724,423			649,793			1,503,504			1,300,470
	Operating Expenses:
	Property operating		131,643			120,462			293,064			233,539
	Depreciation and amortization		142,047			122,981			294,195			246,595
	Real estate taxes		52,797			48,060			107,588			100,678
	Repairs and maintenance		15,944			15,576			35,585			31,118
	Advertising and promotion		17,113			13,967			35,923			29,661
	Provision for credit losses		970			375			4,078			1,512
	Other		44,554			36,170			97,483			71,783
	Total operating expenses		405,068			357,591			867,916			714,886
	Operating Income		319,355			292,202			635,588			585,584
	Interest expense		(150,059	)		(150,887	)		(301,696	)		(294,692	)
	Income from Continuing Operations		169,296			141,315			333,892			290,892
	Income from operations of discontinued joint venture interests		2,094			2,892			5,079			6,629
	Gain on disposal of discontinued operations, net		—			18,356			—			18,356
	Net Income	$	171,390		$	162,563		$	338,971		$	315,877
	Third-Party Investors' Share of Net Income	$	88,217		$	94,949		$	177,530		$	178,715
	Our Share of Net Income		83,173			67,614			161,441			137,162
	Amortization of Excess Investment		(24,383	)		(24,853	)		(49,981	)		(49,682	)
	Our Share of Income from Unconsolidated Discontinued Operations		(307	)		(206	)		(652	)		(499	)
	Income from Unconsolidated Entities	$	58,483		$	42,555		$	110,808		$	86,981

Debt_Tables

Debt (Tables)	6 Months Ended
	Jun. 30, 2014
Debt	'
Schedule of fair value of fixed rate mortgages and the related discount rate assumptions	'
		June 30,	December 31,
		2014	2013
	Fair value of fixed-rate mortgages and unsecured indebtedness	$21,781	$22,316
	Weighted average discount rates assumed in calculation of fair value for fixed-rate mortgages	3.24%	3.07%

Equity_Tables

Equity (Tables)	6 Months Ended
	Jun. 30, 2014
Equity	'
Schedule of LTIP units earned and aggregate grant date fair values adjusted for estimated forfeitures	'
	LTIP Program	LTIP Units Earned		Grant Date Fair Value
	2010 LTIP Program
	1-year 2010 LTIP Program	133,673		1-year program — $7.2 million
	2-year 2010 LTIP Program	337,006		2-year program — $14.8 million
	3-year 2010 LTIP Program	489,654		3-year program — $23.0 million
	2011-2013 LTIP Program	469,848		$35.0 million
	2012-2014 LTIP Program	To be determined in 2015		$35.0 million
	2013-2015 LTIP Program	To be determined in 2016		$33.5 million
	2014-2016 LTIP Program	To be determined in 2017		$30.0 million
Reconciliation of carrying amounts of equity	'
		Preferred			Common		Accumulated			Capital in			Accumulated			Common Stock			Noncontrolling			Total
		Stock			Stock		Other			Excess of			Deficit			Held in			interests			Equity
							Comprehensive			Par Value						Treasury
							Income (Loss)
	January 1, 2014	$	44,390		$	31	$	(75,795	)	$	9,217,363		$	(3,218,686	)	$	(117,897	)	$	973,226		$	6,822,632
	Exchange of limited partner units for common shares										1,190									(1,190	)		—
	Issuance of limited partner units																			84,910			84,910
	Spin-off of Washington Prime													(812,763	)								(812,763	)
	Long-term incentive performance units																			24,969			24,969
	Purchase and disposition of noncontrolling interests, net and other		(164	)							(663	)		26,358			11,149			10,729			47,409
	Adjustment to limited partners' interest from change in ownership in the Operating Partnership										188,680									(188,680	)		—
	Distributions to common stockholders and limited partners, excluding Operating Partnership preferred interests													(793,892	)					(133,858	)		(927,750	)
	Distributions to other noncontrolling interest partners																			(17,607	)		(17,607	)
	Comprehensive income, excluding $957 attributable to preferred interests in the Operating Partnership							14,059						749,904						129,845			893,808
	June 30, 2014	$	44,226		$	31	$	(61,736	)	$	9,406,570		$	(4,049,079	)	$	(106,748	)	$	882,344		$	6,115,608

Organization_Details

Organization (Details)

0 Months Ended

28-May-14

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Strip center business and small malls

U.S. and Puerto Rico

U.S. and Puerto Rico

U.S. and Puerto Rico

U.S. and Puerto Rico

U.S. and Puerto Rico

Japan

South Korea

Canada

Mexico

Malaysia

Europe

Europe

Italy

Austria

Netherlands

United Kingdom

property

property

Malls

Premium Outlets

The Mills

Other shopping centers or outlet centers

Premium Outlets

Premium Outlets

Premium Outlets

Premium Outlets

Premium Outlets

property

Klepierre

property

property

property

property

item

property

property

property

property

property

property

property

property

property

country

Owned, developed and managed retail properties:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of income-producing properties

'

208

115

66

13

14

9

3

1

1

1

5

'

2

1

1

1

Number of U.S. states containing property locations

'

37

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Joint venture ownership percentage

'

'

'

'

'

'

'

'

'

'

'

'

28.90%

'

'

'

'

Number of countries

'

'

'

'

'

'

'

'

'

'

'

'

13

'

'

'

'

Number of properties merged under spin off to Washington Prime, an independent, publicly traded REIT

98

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Basis_of_Presentation_Details

Basis of Presentation (Details)	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2014
	property		McArthurGlen Group	Weighted average	Weighted average	Wholly owned properties	Partially owned properties
			property			property	property
Basis of Presentation	'	'	'	'	'	'	'
Number of properties included in consolidation	'	'	'	'	'	136	13
Total number of joint venture properties	79	'	'	'	'	'	'
Number of joint venture properties managed by the entity	56	'	'	'	'	'	'
Number of properties in which interest is acquired	'	'	5	'	'	'	'
Number of International joint venture properties	20	'	'	'	'	'	'
Number of joint venture properties managed by others	23	'	'	'	'	'	'
Ownership interest:	'	'	'	'	'	'	'
Ownership percentage in the Operating Partnership	85.40%	85.70%	'	85.50%	85.60%	'	'

Significant_Accounting_Policie3

Significant Accounting Policies (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2014
In Millions, unless otherwise specified			Available for sale securities	Available for sale securities
			Securities in captive insurance subsidiary portfolio	Securities in captive insurance subsidiary portfolio
			Minimum	Maximum
Marketable and Non-Marketable Securities	'	'	'	'
Investment maturity period	'	'	'1 year	'10 years
Net unrealized gains (losses) recorded in other comprehensive income (loss)	$1.80	$1.10	'	'
Carrying value of investments under the cost method	$118.80	$118.80	'	'

Significant_Accounting_Policie4

Significant Accounting Policies (Details 2) (Recurring, USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Level 1	'	'
Fair Value Measurements	'	'
Marketable securities with Level 1 fair value inputs	$159.70	$148.30
Level 2	'	'
Fair Value Measurements	'	'
Interest rate swap agreements and foreign currency forward contracts, gross liability balance	0.1	1.2
Interest rate swap agreements and foreign currency forward contracts, gross asset balance	0.3	8.4
Level 3	'	'
Fair Value Measurements	'	'
Investments	$0	'

Significant_Accounting_Policie5

Significant Accounting Policies (Details 3) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Noncontrolling interests, carrying amounts, reclassified to permanent equity:	'	'
Limited partners' interests in the Operating Partnership	$883,987	$968,962
Nonredeemable noncontrolling (deficit) interests in properties, net	-1,643	4,264
Total noncontrolling interests reflected in equity	$882,344	$973,226

Significant_Accounting_Policie6

Significant Accounting Policies (Details 4) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Noncontrolling interests:	'	'	'	'
Balance	'	'	$6,822,632,000	'
Other comprehensive income (loss) allocable to noncontrolling interests:	'	'	'	'
Unrealized (loss) gain on derivative hedge agreements	-8,000	-1,796,000	-7,541,000	5,275,000
Net loss reclassified from accumulated other comprehensive loss into earnings	2,577,000	2,566,000	5,274,000	4,076,000
Currency translation adjustments	4,046,000	-22,960,000	17,779,000	-21,912,000
Changes in available-for-sale securities and other	202,000	-631,000	682,000	-815,000
Purchase and disposition of noncontrolling interests, net and other	'	'	47,409,000	'
Balance	6,115,608,000	'	6,115,608,000	'
Temporary Equity	'	'	'	'
Contribution into the noncontrolling interest partnership	83,000,000	'	'	'
Preferred partnership units preferred return (as a percent)	2.50%	'	'	'
Noncontrolling Interests	'	'	'	'
Noncontrolling interests:	'	'	'	'
Balance	989,988,000	977,753,000	973,226,000	982,486,000
Net income attributable to noncontrolling interests after preferred distributions and income attributable to redeemable noncontrolling interests in consolidated properties	70,060,000	57,202,000	127,710,000	104,761,000
Distributions to noncontrolling interest holders	-74,029,000	-60,082,000	-151,465,000	-119,907,000
Other comprehensive income (loss) allocable to noncontrolling interests:	'	'	'	'
Unrealized (loss) gain on derivative hedge agreements	-17,000	-219,000	-1,253,000	740,000
Net loss reclassified from accumulated other comprehensive loss into earnings	376,000	368,000	768,000	586,000
Currency translation adjustments	586,000	-3,285,000	2,518,000	-3,158,000
Changes in available-for-sale securities and other	30,000	-92,000	102,000	-117,000
Other comprehensive income (loss)	975,000	-3,228,000	2,135,000	-1,949,000
Adjustment to limited partners' interest from change in ownership in the Operating Partnership	-121,454,000	-7,934,000	-188,680,000	-10,581,000
Units issued to limited partners	'	'	84,910,000	'
Units exchanged for common shares	-279,000	-3,461,000	-1,190,000	-5,982,000
Long-term incentive performance units	12,484,000	11,248,000	24,969,000	22,670,000
Purchase and disposition of noncontrolling interests, net and other	4,599,000	'	10,729,000	'
Balance	882,344,000	971,498,000	882,344,000	971,498,000
Temporary Equity	'	'	'	'
Noncontrolling interests redeemable at amounts in excess of fair value	$0	'	$0	'

Significant_Accounting_Policie7

Significant Accounting Policies (Details 5) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014
Significant Accounting Policies	'
Beginning balance	($75,795)
Other comprehensive income (loss) before reclassifications	9,553
Amounts reclassified from accumulated other comprehensive income (loss)	4,506
Net current-period other comprehensive income (loss)	14,059
Ending balance	-61,736
Currency translation adjustments	'
Significant Accounting Policies	'
Beginning balance	-23,781
Other comprehensive income (loss) before reclassifications	15,261
Net current-period other comprehensive income (loss)	15,261
Ending balance	-8,520
Accumulated derivative losses, net	'
Significant Accounting Policies	'
Beginning balance	-52,985
Other comprehensive income (loss) before reclassifications	-6,288
Amounts reclassified from accumulated other comprehensive income (loss)	4,506
Net current-period other comprehensive income (loss)	-1,782
Ending balance	-54,767
Net unrealized gains on marketable securities	'
Significant Accounting Policies	'
Beginning balance	971
Other comprehensive income (loss) before reclassifications	580
Net current-period other comprehensive income (loss)	580
Ending balance	$1,551

Significant_Accounting_Policie8

Significant Accounting Policies (Details 6) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Significant Accounting Policies	'	'	'	'
Interest expense	($254,930)	($266,229)	($509,164)	($537,535)
Net income attributable to noncontrolling interests	70,047	59,755	128,667	110,250
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	406,587	339,936	748,235	623,074
Amount reclassified from accumulated other comprehensive income (loss)	'	'	'	'
Significant Accounting Policies	'	'	'	'
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	'	'	-4,506	-3,490
Accumulated derivative losses, net | Amount reclassified from accumulated other comprehensive income (loss)	'	'	'	'
Significant Accounting Policies	'	'	'	'
Interest expense	'	'	-5,274	-4,076
Net income attributable to noncontrolling interests	'	'	$768	$586

Significant_Accounting_Policie9

Significant Accounting Policies (Details 7)	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2013
In Millions, unless otherwise specified	USD ($)	USD ($)	Interest rate swap	Interest rate swap	Interest rate swap	Currency forward contracts	Currency forward contracts	Currency forward contracts	USD-Yen currency forward contract	USD-Euro currency forward contract	USD-Euro currency forward contract
			USD ($)	Other liabilities	Deferred costs and other assets	USD ($)	Other liabilities	Deferred costs and other assets	JPY (¥)	EUR (€)	Other liabilities
				USD ($)	USD ($)		USD ($)	USD ($)			USD ($)
Derivative financial instruments	'	'	'	'	'	'	'	'	'	'	'
Number of outstanding interest rate derivatives	$0	'	'	'	'	'	'	'	'	'	'
Interest rate net, fair value	'	'	3	-0.4	3.4	'	'	'	'	'	'
Notional Amount	'	'	'	'	'	'	'	'	1,500	74	'
Forward contract net, fair value	'	'	'	'	'	0.2	-0.1	0.3	'	'	-0.8
Gross accumulated other comprehensive income or loss related to derivative activities	$64.10	$61.80	'	'	'	'	'	'	'	'	'

Recovered_Sheet1

Significant Accounting Policies (Details 8) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended
	28-May-14	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
	property
Transaction Expenses	'	'	'	'	'	'
Discontinued operations transaction expenses	'	$38,163,000	'	$38,163,000	'	'
Discontinued Operations	'	'	'	'	'	'
Amount of retained proceeds from recently completed unsecured debt and mortgage debt as part of the spin-off	'	'	'	1,003,135,000	'	'
ASSETS:	'	'	'	'	'	'
Total assets	'	'	'	'	'	3,002,314,000
LIABILITIES:	'	'	'	'	'	'
Total liabilities	'	'	'	'	'	1,117,789,000
Summarized financial information for discontinued operations	'	'	'	'	'	'
CONSOLIDATED NET INCOME	'	26,022,000	41,396,000	67,524,000	97,249,000	'
Minimum | Washington Prime	'	'	'	'	'	'
Additional disclosures	'	'	'	'	'	'
Annual fixed rate property management fees (as a percent)	2.50%	'	'	'	'	'
Maximum | Washington Prime	'	'	'	'	'	'
Additional disclosures	'	'	'	'	'	'
Annual fixed rate property management fees (as a percent)	4.00%	'	'	'	'	'
Strip center business and small malls	'	'	'	'	'	'
Discontinued Operations	'	'	'	'	'	'
Number of properties merged under spin off to Washington Prime, an independent, publicly traded REIT	98	'	'	'	'	'
Amount of retained proceeds from recently completed unsecured debt and mortgage debt as part of the spin-off	1,000,000,000	'	'	'	'	'
ASSETS:	'	'	'	'	'	'
Investment properties at cost	4,802,975,000	'	'	'	'	4,789,705,000
Less - accumulated depreciation	2,034,615,000	'	'	'	'	1,974,949,000
Investment properties, net	2,768,360,000	'	'	'	'	2,814,756,000
Cash and cash equivalents	33,776,000	'	'	'	'	25,857,000
Tenant receivables and accrued revenue, net	53,662,000	'	'	'	'	61,121,000
Investment in unconsolidated entities, at equity	5,189,000	'	'	'	'	3,554,000
Deferred costs and other assets	110,365,000	'	'	'	'	97,026,000
Total assets	2,971,352,000	'	'	'	'	3,002,314,000
LIABILITIES:	'	'	'	'	'	'
Mortgages and unsecured indebtedness	1,929,019,000	'	'	'	'	918,614,000
Accounts payable, accrued expenses, intangibles, and deferred revenues	112,390,000	'	'	'	'	151,011,000
Cash distributions and losses in partnerships and joint ventures, at equity attributable to disposal group.	41,623,000	'	'	'	'	41,313,000
Other liabilities	36,927,000	'	'	'	'	6,851,000
Total liabilities	2,119,959,000	'	'	'	'	1,117,789,000
Net assets transferred to Washington Prime	851,393,000	'	'	'	'	1,884,525,000
Summarized financial information for discontinued operations	'	'	'	'	'	'
TOTAL REVENUE	'	104,683,000	151,570,000	262,652,000	305,805,000	'
Property operating	'	17,035,000	25,455,000	43,175,000	49,820,000	'
Depreciation and amortization	'	31,024,000	45,101,000	76,992,000	90,400,000	'
Real estate taxes	'	12,526,000	18,395,000	32,474,000	38,357,000	'
Repairs and maintenance	'	3,181,000	5,503,000	10,331,000	10,889,000	'
Advertising and promotion	'	1,388,000	1,808,000	3,340,000	3,945,000	'
Provision for (recovery of) credit losses	'	708,000	-806,000	1,494,000	-116,000	'
Other	'	910,000	1,163,000	2,028,000	2,354,000	'
Total operating expenses	'	66,772,000	96,619,000	169,834,000	195,649,000	'
OPERATING INCOME	'	37,911,000	54,951,000	92,818,000	110,156,000	'
Interest expense	'	-12,159,000	-13,737,000	-26,076,000	-27,456,000	'
Income and other taxes	'	-37,000	-24,000	-112,000	-102,000	'
Income from unconsolidated entities	'	307,000	206,000	652,000	499,000	'
Gain upon acquisition of controlling interests and sale or disposal of assets and interests in unconsolidated entities, net	'	'	'	242,000	14,152,000	'
CONSOLIDATED NET INCOME	'	26,022,000	41,396,000	67,524,000	97,249,000	'
Net income attributable to noncontrolling interests	'	3,792,000	5,963,000	9,781,000	13,995,000	'
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	'	22,230,000	35,433,000	57,743,000	83,254,000	'
Additional disclosures	'	'	'	'	'	'
Capital expenditures on a cash basis	'	$7,100,000	$18,300,000	$31,900,000	$42,500,000	'
Strip center business and small malls | Washington Prime	'	'	'	'	'	'
Additional disclosures	'	'	'	'	'	'
Term of property management agreement	'2 years	'	'	'	'	'
Renewal term of property management agreement	'1 year	'	'	'	'	'
Termination period of property management agreement	'2 years	'	'	'	'	'
Period of prior written notice for termination of property management agreement	'180 days	'	'	'	'	'
Termination period of transition services agreement	'2 years	'	'	'	'	'
Minimum notice period for transition services agreement	'180 days	'	'	'	'	'
Minimum notice period as percentage of original service period	50.00%	'	'	'	'	'
Exchange ratio of common shares for entity's stockholders to receive under spin off	0.5	'	'	'	'	'
Strip center business and small malls | Washington Prime Group, L.P.	'	'	'	'	'	'
Discontinued Operations	'	'	'	'	'	'
Exchange ratio of common units for entity's stockholders to receive under spin off	0.5	'	'	'	'	'

Per_Share_Data_Details

Per Share Data (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Per Share Data	'	'	'	'
Net Income attributable to Common Stockholders - Basic	$406,587	$339,936	$748,235	$623,074
Net Income attributable to Common Stockholders - Diluted	406,587	339,936	748,235	623,074
Weighted Average Shares Outstanding - Basic	310,743,242	310,261,278	310,683,240	310,124,651
Effect of stock options (in shares)	'	'	'	103
Weighted Average Shares Outstanding - Diluted	310,743,242	310,261,278	310,683,240	310,124,754
Effect of dilutive securities:	'	'	'	'
Securities with dilutive effect	'	'	$0	'

Investment_in_Unconsolidated_E2

Investment in Unconsolidated Entities (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Schedule of Equity Method Investments	'	'
Total number of joint venture properties	79	'
Construction and other related party loans	'	'
Schedule of Equity Method Investments	'	'
Loans to related party	$173.80	$140.30

Investment_in_Unconsolidated_E3

Investment in Unconsolidated Entities (Details 2) (USD $)	0 Months Ended	3 Months Ended
In Millions, unless otherwise specified	28-May-14	Mar. 31, 2014	Jan. 30, 2014
	Unconsolidated property interests	Arizona Mills	Arizona Mills
	property
Business acquisition	'	'	'
Ownership interests acquired (as a percent)	'	'	50.00%
Gain due to acquisition of controlling interest	'	$2.70	'
Ownership interest after acquisition (as a percent)	'	'	100.00%
Number of unconsolidated properties in the spin-off of Washington Prime	10	'	'

Investment_in_Unconsolidated_E4

Investment in Unconsolidated Entities (Details 3)

3 Months Ended

6 Months Ended

0 Months Ended

12 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

6 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Apr. 16, 2014

Apr. 16, 2014

Dec. 31, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Oct. 16, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Klepierre

Klepierre

McArthurGlen Group

McArthurGlen Group

McArthurGlen Group

Europe

Europe

Europe

Europe

Europe

Europe

Europe

USD ($)

EUR (€)

property

Minimum

Ashford Designer Outlets

Klepierre

Klepierre

McArthurGlen Group

McArthurGlen Group

McArthurGlen Group

McArthurGlen Group

McArthurGlen Group

property

item

USD ($)

USD ($)

property

USD ($)

USD ($)

Minimum

Maximum

Schedule of Equity Method Investments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares owned

'

'

'

'

'

'

'

'

'

'

57,634,148

'

'

'

'

'

'

Joint venture ownership percentage

'

'

'

'

'

'

'

'

'

45.00%

28.90%

'

'

'

'

45.00%

90.00%

Quoted market price per share (in dollars per share)

'

'

'

'

'

'

'

'

'

'

$50.78

'

'

'

'

'

'

Share of net income, net of amortization of our excess investment

$55,764,000

$56,310,000

$112,842,000

$110,248,000

'

'

'

'

'

'

$135,900,000

$23,300,000

'

'

'

'

'

Total revenues

'

'

'

'

'

'

'

'

'

'

654,800,000

725,600,000

'

'

'

'

'

Total operating income

'

'

'

'

'

'

'

'

'

'

281,100,000

282,900,000

'

'

'

'

'

Total gross consideration

'

'

'

'

'

'

1,980,000,000

'

'

'

'

'

'

'

'

'

'

Group's share of total consideration

'

'

'

'

'

'

1,650,000,000

'

'

'

'

'

'

'

'

'

'

Gain upon acquisition of controlling interests and sale or disposal of assets and interest in unconsolidated entities, net

'

'

'

'

'

133,900,000

'

'

'

'

'

'

'

'

'

'

'

Number of joint ventures to invest in per definitive agreement

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

Consolidated net Income

'

'

'

'

'

'

'

'

'

'

1,200,000,000

97,900,000

'

'

'

'

'

Number of outlets in which interest acquired

'

'

'

'

'

'

'

5

'

'

'

'

4

'

'

'

'

Number of retail galleries disposed

'

'

'

'

'

126

126

'

'

'

'

'

'

'

'

'

'

Additional noncontrolling interest purchased

'

'

'

'

'

'

'

'

'

22.50%

'

'

'

'

'

'

'

Purchase price of business acquired

'

'

'

'

'

'

'

'

'

'

'

'

'

496,700,000

'

'

'

Equity investment

$2,523,431,000

'

$2,523,431,000

'

$2,429,845,000

'

'

'

'

'

'

'

'

$674,800,000

$510,700,000

'

'

Investment_in_Unconsolidated_E5

Investment in Unconsolidated Entities (Details 4) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
	property
Cost method investments	'	'
Cost method investments included in deferred costs and other assets	$118.80	$118.80
Europe | Value Retail PLC	'	'
Cost method investments	'	'
Number of luxury outlets owned and operated	9	'
Number of outlets in which the entity has a minority direct ownership	3	'
Cost method investments included in deferred costs and other assets	$115.40	$115.40

Investment_in_Unconsolidated_E6

Investment in Unconsolidated Entities (Details 5) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Equity Method Investments	'	'
Equity investment	$2,523,431	$2,429,845
Japan | Mitsubishi Estate Co., Ltd. | Premium Outlet operations	'	'
Schedule of Equity Method Investments	'	'
Joint venture ownership percentage	40.00%	'
Equity investment	262,800	261,100
South Korea | Shinsegae International Co | Premium Outlet operations	'	'
Schedule of Equity Method Investments	'	'
Joint venture ownership percentage	50.00%	'
Equity investment	$95,800	$76,400

Investment_in_Unconsolidated_E7

Investment in Unconsolidated Entities (Details 6) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014
In Thousands, unless otherwise specified			Equity Method Investments	Equity Method Investments	Equity Method Investments
			Unconsolidated property interests	Unconsolidated property interests	Unconsolidated property interests
					Maximum
Assets:	'	'	'	'	'
Investment properties, at cost	$30,951,535	$30,336,639	$15,842,291	$15,355,700	'
Less - accumulated depreciation	8,568,672	8,092,794	5,280,359	5,080,832	'
Investment properties, net	22,382,863	22,243,845	10,561,932	10,274,868	'
Cash and cash equivalents	1,665,817	1,691,006	756,563	781,554	'
Tenant receivables and accrued revenue, net	487,839	520,361	304,679	302,902	'
Investment in unconsolidated entities, at equity	'	'	28,517	38,352	'
Deferred costs and other assets	1,523,877	1,422,788	589,390	579,480	'
Total assets of discontinued operations	'	3,002,314	'	281,000	'
Total assets	'	'	12,241,081	12,258,156	'
Liabilities and Partners' Deficit:	'	'	'	'	'
Mortgages and unsecured indebtedness	21,901,060	22,669,917	12,764,686	12,753,139	'
Accounts payable, accrued expenses, intangibles, and deferred revenues	1,147,425	1,223,102	980,159	834,898	'
Other liabilities	280,483	250,371	568,158	513,897	'
Total liabilities of discontinued operations	'	1,117,789	'	286,252	'
Total liabilities	24,445,269	26,311,457	14,313,003	14,388,186	'
Preferred units	'	'	67,450	67,450	'
Partners' deficit	-4,049,079	-3,218,686	-2,139,372	-2,197,480	'
Total liabilities and equity	30,586,414	33,324,574	12,241,081	12,258,156	'
Our Share of:	'	'	'	'	'
Partners' deficit	'	'	-541,435	-717,776	'
Add: Excess Investment	'	'	1,948,565	2,059,584	'
Add: Our Share of investment in discontinued unconsolidated entities, at equity	'	'	'	37,759	'
Our net Investment in unconsolidated entities, at equity	$2,523,431	$2,429,845	$1,407,130	$1,379,567	'
Life of joint ventures with excess investment	'	'	'	'	'40 years

Investment_in_Unconsolidated_E8

Investment in Unconsolidated Entities (Details 7) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue:	'	'	'	'
Minimum rent	$728,486	$674,654	$1,450,768	$1,347,581
Overage rent	39,160	39,077	70,834	74,343
Tenant reimbursements	342,250	307,359	667,721	600,957
Other income	37,944	32,089	84,932	61,392
Total revenue	1,181,982	1,084,993	2,339,004	2,145,816
Operating Expenses:	'	'	'	'
Property operating	92,630	92,024	187,577	177,568
Depreciation and amortization	287,214	273,537	567,708	544,872
Real estate taxes	99,396	91,014	193,699	180,757
Repairs and maintenance	21,656	21,604	51,421	45,943
Advertising and promotion	38,149	27,552	60,768	46,674
Provision for credit losses	2,442	-495	6,866	1,549
Other	18,407	17,441	37,769	34,251
Total operating expenses	620,451	575,054	1,216,508	1,133,394
OPERATING INCOME	561,531	509,939	1,122,496	1,012,422
Interest expense	-254,930	-266,229	-509,164	-537,535
Income from Unconsolidated Entities	55,764	56,310	112,842	110,248
Equity Method Investments | Unconsolidated property interests	'	'	'	'
Revenue:	'	'	'	'
Minimum rent	427,899	387,600	852,684	769,072
Overage rent	41,589	39,997	90,386	87,613
Tenant reimbursements	193,006	182,799	385,799	362,393
Other income	61,929	39,397	174,635	81,392
Total revenue	724,423	649,793	1,503,504	1,300,470
Operating Expenses:	'	'	'	'
Property operating	131,643	120,462	293,064	233,539
Depreciation and amortization	142,047	122,981	294,195	246,595
Real estate taxes	52,797	48,060	107,588	100,678
Repairs and maintenance	15,944	15,576	35,585	31,118
Advertising and promotion	17,113	13,967	35,923	29,661
Provision for credit losses	970	375	4,078	1,512
Other	44,554	36,170	97,483	71,783
Total operating expenses	405,068	357,591	867,916	714,886
OPERATING INCOME	319,355	292,202	635,588	585,584
Interest expense	-150,059	-150,887	-301,696	-294,692
Income from Continuing Operations	169,296	141,315	333,892	290,892
Income from operations of discontinued joint venture interests	2,094	2,892	5,079	6,629
Gain on disposal of discontinued operations, net	'	18,356	'	18,356
Net Income	171,390	162,563	338,971	315,877
Third-Party Investors' Share of Net Income	88,217	94,949	177,530	178,715
Our Share of Net Income	83,173	67,614	161,441	137,162
Amortization of Excess Investment	-24,383	-24,853	-49,981	-49,682
Our share of loss on sale or disposal of assets and interests in unconsolidated entities, net	-307	-206	-652	-499
Income from Unconsolidated Entities	$58,483	$42,555	$110,808	$86,981

Debt_Details

Debt (Details) (USD $)

6 Months Ended

12 Months Ended

6 Months Ended

6 Months Ended

0 Months Ended

0 Months Ended

6 Months Ended

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jan. 21, 2014

Jan. 21, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Apr. 07, 2014

Apr. 07, 2014

Jun. 30, 2014

Feb. 28, 2014

Jan. 02, 2014

Jun. 30, 2014

Dec. 31, 2013

Unsecured Debt

Unsecured Debt

Unsecured Debt

Unsecured Debt

Unsecured Debt

Unsecured Debt

Unsecured Debt

Unsecured Debt

Unsecured Debt

Unsecured Debt

Secured Debt

Secured Debt

Secured Debt

Secured Debt

Senior unsecured notes

Senior unsecured notes 4.9% to 6.75%

Senior unsecured notes 2.20% due February 2019

Senior unsecured notes 3.75% due February 2024

Credit Facility and the Supplemental Facility

Credit Facility

Supplemental Facility

Amended Credit Facility

Amended Credit Facility

Term loan

Mortgages

Mortgages

Mortgages

Mortgages

Operating Partnership

Operating Partnership

Operating Partnership

Operating Partnership

Operating Partnership

Operating Partnership

Operating Partnership

Maximum

note

item

Operating Partnership

mortgagepool

property

Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total Mortgages and Other Indebtedness

$21,901,060,000

$22,669,917,000

$14,400,000,000

'

'

'

'

'

'

'

'

$240,000,000

'

'

$6,300,000,000

$7,300,000,000

Credit facility, amount outstanding

'

'

'

'

'

'

'

652,200,000

219,500,000

'

'

'

'

'

'

'

Maximum borrowing capacity

'

'

'

'

'

'

'

4,000,000,000

2,000,000,000

'

'

'

'

'

'

'

Available borrowing capacity

'

'

'

'

'

'

5,100,000,000

'

'

'

'

'

'

'

'

'

Maximum amount outstanding during period

'

'

'

'

'

'

1,200,000,000

'

'

'

'

'

'

'

'

'

Credit facility, weighted average amount outstanding

'

'

'

'

'

'

923,000,000

'

'

'

'

'

'

'

'

'

Letters of credit outstanding

'

'

'

'

'

'

41,800,000

'

'

'

'

'

'

'

'

'

Number of credit facilities

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

Expanded maximum borrowing capacity

'

'

'

'

'

'

'

'

2,500,000,000

5,000,000,000

'

'

'

'

'

'

Percentage of borrowings in currencies other than the U.S. Dollar

'

'

'

'

'

'

'

'

'

'

75.00%

'

'

'

'

'

Reference rate

'

'

'

'

'

'

'

'LIBOR

'LIBOR

'LIBOR

'

'

'

'

'

'

Interest added to reference rate (as a percent)

'

'

'

'

'

'

'

0.80%

0.95%

0.80%

'

'

'

'

'

'

Additional facility fee (as a percent)

'

'

'

'

'

'

'

0.10%

0.15%

0.10%

'

'

'

'

'

'

Multi-currency tranche

'

'

'

'

'

'

'

2,000,000,000

'

'

'

'

'

'

'

'

Amount of debt redeemed

'

'

'

716,100,000

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate, low end of range (as a percent)

'

'

'

4.90%

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate, high end of range (as a percent)

'

'

'

6.75%

'

'

'

'

'

'

'

'

'

'

'

'

Debt issued

'

'

'

'

600,000,000

600,000,000

'

'

'

'

'

'

'

'

'

'

Interest rate on debt (as a percent)

'

'

'

'

2.20%

3.75%

'

'

'

'

'

'

'

'

'

'

Debt repaid

'

'

'

'

'

'

'

'

'

'

'

'

269,000,000

820,000,000

'

'

Debt covenants

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of non-recourse mortgage notes under which the Company and subsidiaries are borrowers

'

'

'

'

'

'

'

'

'

'

'

'

'

'

42

'

Number of properties secured by non-recourse mortgage notes

'

'

'

'

'

'

'

'

'

'

'

'

'

'

56

'

Number of cross-defaulted and cross-collateralized mortgage pools

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5

'

Total number of properties pledged as collateral for cross defaulted and cross collateralized mortgages

'

'

'

'

'

'

'

'

'

'

'

'

'

'

21

'

Fair value of debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Carrying value of fixed-rate mortgages and unsecured indebtedness

20,200,000,000

20,900,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of fixed-rate mortgages and unsecured indebtedness

$21,781,000,000

$22,316,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average discount rates assumed in calculation of fair value for fixed-rate mortgages (as a percent)

3.24%

3.07%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity_Details

Equity (Details)	Jan. 30, 2014	Jan. 30, 2014	Jun. 30, 2014
	Arizona Mills	Operating Partnership	Partnership agreement of Operating Partnership
	acre	Arizona Mills	item
Equity	'	'	'
Common stock, shares issued	'	'	63,629
The number of limited partners who received common stock in exchange for an equal number of units, during the period.	'	'	4
Number of units issued in connection with acquisition of the remaining interest in Arizona Mills	'	555,150	'
Ownership interests acquired (as a percent)	50.00%	'	'
Area of land acquired (in acre) in Oyster Bay, New York	39	'	'

Equity_Details_2

Equity (Details 2) (USD $)

6 Months Ended

1 Months Ended

6 Months Ended

0 Months Ended

6 Months Ended

0 Months Ended

6 Months Ended

In Millions, except Share data, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2013

Jul. 31, 2011

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Apr. 02, 2014

Feb. 26, 2014

Jun. 30, 2014

Jun. 30, 2014

28-May-14

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Restricted stock

Restricted stock

LTIP Retention Award to Chairman and CEO

LTIP Retention Award to Chairman and CEO

LTIP Retention Award to Chairman and CEO

LTIP Retention Award to Chairman and CEO

1998 Stock Incentive Plan

1998 Stock Incentive Plan

1998 Stock Incentive Plan

1998 Stock Incentive Plan

1998 Stock Incentive Plan

LTIP programs

LTIP programs

One-year 2010 LTIP Program

Two-year 2010 LTIP Program

Three-year 2010 LTIP Program

2011-2013 LTIP Program

2012-2014 LTIP Program

2013-2015 LTIP program

2014-2016 LTIP program

A Units

B Units

C Units

Restricted stock

Restricted stock

Restricted stock

Restricted stock

Restricted stock

Maximum

Maximum

Maximum

Employees

Employees

Employees

Director

Non-employee Directors

Stock-based incentive plan awards

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percent of distributions of Operating Partnership that participants are entitled to receive during performance period

'

'

'

'

'

'

'

'

'

'

'

10.00%

'

'

'

'

'

'

'

'

Award of restricted stock to employees (in shares)

'

'

1,000,000

'

'

'

62,565

1,246

'

'

3,570

'

'

'

'

'

'

'

'

'

Performance period

'

'

'

'

'

'

'

'

'

'

'

'

'

'1 year

'2 years

'3 years

'

'

'

'

Units earned under LTIP program (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

133,673

337,006

489,654

469,848

'

'

'

Units to be earned under LTIP program (in shares)

'

'

'

360,000

360,000

280,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate grant date fair value

'

'

$120.30

'

'

'

'

'

'

'

'

'

'

$7.20

$14.80

$23

$35

$35

$33.50

$30

Compensation expense, net of capitalization

$7.10

$6.90

'

'

'

'

'

'

'

'

'

$13.60

$12.60

'

'

'

'

'

'

'

Weighted average fair value of shares granted during the year (in dollars per share)

'

'

'

'

'

'

$164.92

$161.06

'

'

$176.55

'

'

'

'

'

'

'

'

'

Vesting period

'

'

'

'

'

'

'

'

'3 years

'1 year

'

'2 years

'

'

'

'

'

'

'

'

Vesting rights percentage

'

'

'

'

'

'

'

'

'

'

'

50.00%

'

'

'

'

'

'

'

'

Service period

'

'

'8 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity_Details_3

Equity (Details 3) (USD $)

6 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

In Thousands, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Preferred Stock

Common Stock

Common Stock

Accumulated Other Comprehensive Income (Loss)

Capital in Excess of Par Value

Accumulated Deficit

Common Stock Held in Treasury

Noncontrolling Interests

Noncontrolling Interests

Noncontrolling Interests

Noncontrolling Interests

Increase (Decrease) in Stockholders' Equity

'

'

'

'

'

'

'

'

'

'

'

'

Balance

$6,822,632

$44,390

$31

$31

($75,795)

$9,217,363

($3,218,686)

($117,897)

$989,988

$977,753

$973,226

$982,486

Exchange of limited partner units for common shares

'

'

'

'

'

1,190

'

'

-279

-3,461

-1,190

-5,982

Issuance of limited partner units

84,910

'

'

'

'

'

'

'

'

'

84,910

'

Spin-off of Washington Prime

-812,763

'

'

'

'

'

-812,763

'

'

'

'

'

Long-term incentive performance units

24,969

'

'

'

'

'

'

'

'

'

24,969

'

Purchase and disposition of noncontrolling interests, net and other

47,409

-164

'

'

'

-663

26,358

11,149

4,599

'

10,729

'

Adjustment to limited partners' interest from change in ownership in the Operating Partnership

'

'

'

'

'

188,680

'

'

'

'

-188,680

'

Distributions to common stockholders and limited partners, excluding Operating Partnership preferred interests

-927,750

'

'

'

'

'

-793,892

'

'

'

-133,858

'

Distributions to other noncontrolling interest partners

-17,607

'

'

'

'

'

'

'

'

'

-17,607

'

Comprehensive income, excluding $957 attributable to preferred interests in the Operating Partnership

893,808

'

'

'

14,059

'

749,904

'

'

'

129,845

'

Balance

6,115,608

44,226

31

31

-61,736

9,406,570

-4,049,079

-106,748

882,344

971,498

882,344

971,498

Comprehensive income attributable to preferred interests in the Operating Partnership

'

($957)

'

'

'

'

'

'

'

'

'

'

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	1 Months Ended
In Millions, unless otherwise specified	31-May-10	Jun. 30, 2014	Dec. 31, 2013
		Joint Venture Mortgage and Indebtedness	Joint Venture Mortgage and Indebtedness
Commitments and Contingencies.	'	'	'
Insurance proceeds funded by insurers	$50	'	'
Minimum insurance coverage	50	'	'
Additional insurance proceeds	150	'	'
Guarantees of Joint Venture Indebtedness:	'	'	'
Loan guarantee	'	229.1	190.8
Loan guarantees recoverable	'	$90.30	$83

Commitments_and_Contingencies_1

Commitments and Contingencies (Details 2) (Consolidated revenues, Concentration of credit risk, Maximum)	6 Months Ended
	Jun. 30, 2014
Consolidated revenues | Concentration of credit risk | Maximum	'
Concentration of Credit Risk	'
Percentage of consolidated revenues from a single customer or tenant	5.00%

Real_Estate_Acquisitions_and_D1

Real Estate Acquisitions and Dispositions (Details) (USD $)	12 Months Ended	0 Months Ended		3 Months Ended	0 Months Ended		3 Months Ended	0 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	30-May-13	Jan. 30, 2014	Mar. 31, 2014	Jan. 30, 2014	Jan. 10, 2014	Mar. 31, 2013	Jan. 10, 2014
	McArthurGlen Group	Outlet center, Portland OR	Arizona Mills	Arizona Mills	Arizona Mills	Portfolio of ten properties	Unconsolidated properties	Consolidated properties
	property	sqft	acre		Operating Partnership	property	Community Centers	Portfolio of ten properties
							property	property
Owned, developed and managed retail properties:	'	'	'	'	'	'	'	'
Number of properties in which interest is acquired	5	'	'	'	'	10	3	7
Number of properties disposed of during the period	'	'	'	'	'	'	3	'
Gain (loss) on disposition	'	'	'	'	'	'	$20.80	'
Property interest acquired (as a percent)	'	100.00%	'	'	'	'	'	'
Area of property acquired (in square feet or acre)	'	390,000	39	'	'	'	'	'
Consideration paid	'	'	145.8	'	'	114.4	'	'
Number of units issued in connection with acquisition	'	'	'	'	555,150	'	'	'
Mortgage liability	'	'	166.9	'	'	'	'	'
Gain due to acquisition of controlling interest	'	'	'	2.7	'	'	'	'
Property interest acquired	'	146.7	'	'	'	'	'	'
Gain on acquisition of property interests	'	27.3	'	'	'	'	'	'
Ownership interests acquired (as a percent)	'	'	50.00%	'	'	'	'	'
Ownership interest after acquisition (as a percent)	'	'	100.00%	'	'	'	'	'
Number of partner's interest acquired	'	'	'	'	'	1	'	'
Gain (loss) on disposition from discontinued operations	'	'	'	'	'	'	$14.20	'