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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 |
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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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- Definition 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
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- 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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- 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
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- Definition The amount of square footage related to a real estate property. + References No definition available. + Details
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