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Stockholders' Equity: (Stock Warrants) (Details) (Freehold Raceway Mall and Chandler Fashion Center, USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended |
--- | --- | ---
Oct. 24, 2012 | Apr. 10, 2012 | Dec. 30, 2011 | Sep. 30, 2009 | Dec. 31, 2011
Freehold Raceway Mall and Chandler Fashion Center |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Aggregate number of common shares available for purchase under warrants |  |  |  | 935,358 |
Value of stock warrants |  |  |  | $ 6,496 |
Exercise price of stock warrants (in dollars per share) |  |  |  | 46.68 |
Exercise of stock warrants | $ 3,922 | $ 3,448 | $ 1,278 |  |
Number of common shares available for purchase under warrant (in shares) | 311,786 | 311,786 |  |  | 311,786

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- Definition Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28183637&loc=d3e4724-112606 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Warrant -URI http://asc.fasb.org/extlink&oid=6528364 + Details
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