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Acquisitions: (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended			1 Months Ended	6 Months Ended	1 Months Ended	3 Months Ended	6 Months Ended		1 Months Ended					1 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2012	Dec. 31, 2011	Feb. 28, 2011 Desert Sky Mall squarefoot	Jun. 30, 2011 Desert Sky Mall	Jun. 30, 2011 Superstition Springs Land	Jun. 30, 2011 Superstition Springs Land	Jun. 30, 2011 Superstition Springs Land	Jun. 03, 2011 Superstition Springs Land	Jul. 31, 2011 Fashion Outlets of Niagara squarefoot	Jun. 30, 2012 Fashion Outlets of Niagara	Jul. 22, 2011 Fashion Outlets of Niagara	Dec. 31, 2011 SDG Acquisition Properties	Apr. 29, 2011 Kohl's store at Capitola Mall	Feb. 29, 2012 500 North Michigan Avenue: squarefoot	Jun. 30, 2012 500 North Michigan Avenue:	Feb. 28, 2012 500 North Michigan Avenue:
Acquisition
Additional ownership interest (as a percent)				50.00%					50.00%
Property square footage				893,863						529,059					324,000
Purchase price on acquisition				$ 27,625										$ 28,500			$ 70,925
Ownership interest at completion of acquisition (as a percent)				100.00%					100.00%				100.00%
Purchase price funded by cash payment on acquisition				1,875								78,579
Purchase price paid through assumption of debt by the Company	56,900			25,750
Payment of mortgage note				51,500
Increase in purchase price due to contingent consideration, high end of range												218,667
Fair value of contingent consideration											15,417
Allocation of the fair value
Property				46,603								228,720	371,344				66,033
Restricted cash												5,367
Deferred charges, net				5,474								10,383	30,786				7,450
Cash and cash equivalents				6,057
Tenant receivables				202									10,048
Other assets, net				4,481								3,090	32,826				2,143
Total assets acquired				62,817								247,560	445,004				75,626
Mortgage note payable				51,500								130,006	211,543
Accounts payable				33								231	10,416
Other accrued liabilities				3,017								38,037	18,578				4,701
Total liabilities assumed				54,550								168,274	240,537				4,701
Fair value of acquired net assets (at 100% ownership)				8,267								79,286	204,467				70,925
Business combination
Fair value of existing ownership interest (at 50% ownership)				4,134					12,914
Carrying value of investment in Desert Sky Mall		(1,120,832)	(1,098,560)	(2,296)
Gain on remeasurement				1,838	1,838	1,734	1,734	1,734
Incremental revenue generated from acquired property																3,210
Incremental loss of acquired property																$ 197

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6382870&loc=d3e33749-111570

+ Details

Name:	us-gaap_EquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 32

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of square footage related to a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_SquareFootageOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration