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Stockholders' Equity: (Details 2) (Freehold Raceway Mall and Chandler Fashion Center, USD $)	0 Months Ended	1 Months Ended		12 Months Ended
	Oct. 24, 2012	Apr. 30, 2012	Sep. 30, 2009	Dec. 31, 2011	Apr. 10, 2012
Freehold Raceway Mall and Chandler Fashion Center
Warrants:
Aggregate number of common shares available for purchase under warrants			935,358
Value of stock warrants			$ 6,496,000
Exercise price of stock warrants (in dollars per share)			$ 46.68
Number of shares of warrants exercised	311,786			311,786	311,786
Exercise of stock warrants	$ 3,922,000	$ 3,448,000		$ 1,278,000

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

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- Definition

Represents the number of shares of warrants exercised.

+ References

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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

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

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

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-Paragraph 10

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-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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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- Definition

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

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- Definition

The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt.

+ References

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-Name Statement of Financial Accounting Standard (FAS)

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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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.



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