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Stockholders' Equity: (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended	1 Months Ended
	Dec. 31, 2011 FlatIron Crossing	Sep. 30, 2009 Freehold Raceway Mall and Chandler Fashion Center D
Warrants:
Aggregate number of common shares available for purchase under warrants		935,358
Value of stock warrants		$ 6,496
Exercise of stock warrants	$ 1,278
Expiration period of exercisable stock warrants following refinancing or repayment of related loans (in days)		30
Exercise price of stock warrants (in dollars per share)		$ 46.68
Number of shares of warrants exercised	311,786

X

- Definition

The aggregate number of securities that a class of warrants or rights outstanding gives the holder(s) the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date.

+ References

No definition available.

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- Definition

Represents the number of shares of warrants exercised.

+ References

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- Definition

Period of expiration of exercisable warrants, after the refinancing or repayment of each loan encumbering the related property has closed.

+ References

No definition available.

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- Definition

Increase in additional paid in capital due to warrants issued during the period. Includes also the proceeds of debt securities issued with detachable stock purchase warrants that are allocable to the warrants. These warrants qualify for equity classification and provide the holder with a right to purchase stock from the entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Warrant

-URI http://asc.fasb.org/extlink&oid=6528364



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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

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-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-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.



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-Publisher FASB

-Name Accounting Standards Codification

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-Name Accounting Principles Board Opinion (APB)

-Number 14

-Paragraph 16

-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 8: http://www.xbrl.org/2003/role/presentationRef

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-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

The exercise price of each class of warrants or rights outstanding.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 4

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-Paragraph i

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- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-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.



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

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