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Acquisitions: (Details) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 1 Months Ended |  |  |  |  |  | 12 Months Ended |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Feb. 28, 2011 Desert Sky Mall sqft | Dec. 31, 2011 Desert Sky Mall | Jun. 30, 2011 Superstition Springs Land | Dec. 31, 2011 Superstition Springs Land | Jun. 03, 2011 Superstition Springs Land | Jul. 31, 2011 Fashion Outlets of Niagara | Dec. 31, 2012 Fashion Outlets of Niagara | Dec. 31, 2011 Fashion Outlets of Niagara | Jul. 22, 2011 Fashion Outlets of Niagara sqft | Dec. 31, 2011 SDG Acquisition Properties | Apr. 29, 2011 Kohl's store at Capitola Mall | Dec. 31, 2012 500 North Michigan Avenue: | Feb. 29, 2012 500 North Michigan Avenue: sqft | Oct. 03, 2012 FlatIron Crossing sqft | Dec. 31, 2012 FlatIron Crossing | Oct. 26, 2012 Arrowhead Towne Center sqft | Dec. 31, 2012 Arrowhead Towne Center | Jan. 03, 2013 Kings Plaza | Nov. 28, 2012 Kings Plaza sqft | Dec. 31, 2012 Kings Plaza
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional ownership interest (as a percent) |  |  | 50.00% | 50.00% | 50.00% |  | 50.00% |  |  |  |  |  |  |  |  | 75.00% | 75.00% | 33.30% | 33.30% |  |  |
Property square footage |  |  | 890,000 |  |  |  |  |  |  |  | 530,000 |  |  |  | 327,000 | 1,443,000 |  | 1,196,000 |  |  | 1,198,000 |
Purchase price on acquisition |  |  | $ 27,625,000 |  |  |  |  |  |  |  | $ 200,000,000 |  | $ 28,500,000 |  | $ 70,925,000 | $ 310,397,000 |  | $ 144,400,000 |  |  | $ 756,000,000 |
Ownership interest at completion of acquisition (as a percent) |  |  | 100.00% |  |  |  | 100.00% |  |  |  |  | 100.00% |  |  |  | 100.00% |  | 100.00% |  |  |  |
Fair value of existing ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  | 66.70% |  |  |  |
Purchase price funded by cash payment on acquisition |  |  | 1,875,000 |  |  |  |  |  |  |  | 78,579,000 |  |  |  |  | 195,900,000 |  | 69,025,000 |  |  | 726,000,000 |
Issuance restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000,000 |
Placement of mortgage note on the property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 146,000,000 | 354,000,000 |
Purchase price paid through assumption of debt by the Company | 420,123,000 | 192,566,000 | 25,750,000 |  |  |  |  | 121,421,000 |  |  |  |  |  |  |  | 114,497,000 |  | 75,374,000 |  |  |  |
Payment of mortgage note |  |  | 51,500,000 |  |  |  |  |  |  |  |  |  |  |  |  | 114,497,000 |  |  |  |  |  |
Increase in purchase price due to contingent consideration, high end of range |  |  |  |  |  |  |  |  |  |  | 218,322,000 |  |  |  |  |  |  |  |  |  |  |
Fair value of contingent consideration |  |  |  |  |  |  |  |  | 16,083,000 | 14,786,000 |  |  |  |  |  |  |  |  |  |  |  |
Allocation of the fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property |  |  | 46,603,000 |  |  |  |  |  |  |  | 228,720,000 | 371,344,000 |  |  | 66,033,000 | 443,391,000 |  | 423,349,000 |  |  | 714,589,000 |
Deferred charges |  |  | 5,474,000 |  |  |  |  |  |  |  | 10,383,000 | 30,786,000 |  |  | 7,450,000 | 25,251,000 |  | 31,500,000 |  |  | 37,371,000 |
Restricted cash |  |  |  |  |  |  |  |  |  |  | 5,367,000 |  |  |  |  |  |  | 4,009,000 |  |  |  |
Cash and cash equivalents |  |  | 6,057,000 |  |  |  |  |  |  |  |  |  |  |  |  | 3,856,000 |  |  |  |  |  |
Tenant receivables |  |  | 202,000 |  |  |  |  |  |  |  |  | 10,048,000 |  |  |  |  |  | 926,000 |  |  |  |
Other assets |  |  | 4,481,000 |  |  |  |  |  |  |  | 3,090,000 | 32,826,000 |  |  | 2,143,000 | 2,101,000 |  | 4,234,000 |  |  | 29,282,000 |
Total assets acquired |  |  | 62,817,000 |  |  |  |  |  |  |  | 247,560,000 | 445,004,000 |  |  | 75,626,000 | 474,599,000 |  | 464,018,000 |  |  | 781,242,000 |
Mortgage note payable |  |  | 51,500,000 |  |  |  |  |  |  |  | 130,006,000 | 211,543,000 |  |  |  | 175,720,000 |  | 244,403,000 |  |  |  |
Accounts payable |  |  | 33,000 |  |  |  |  |  |  |  | 231,000 | 10,416,000 |  |  |  | 366,000 |  | 815,000 |  |  |  |
Other accrued liabilities |  |  | 3,017,000 |  |  |  |  |  |  |  | 38,037,000 | 18,578,000 |  |  | 4,701,000 | 11,071,000 |  | 10,449,000 |  |  | 25,242,000 |
Total liabilities assumed |  |  | 54,550,000 |  |  |  |  |  |  |  | 168,274,000 | 240,537,000 |  |  | 4,701,000 | 187,157,000 |  | 255,667,000 |  |  | 25,242,000 |
Fair value of acquired net assets (at 100% ownership) |  |  | 8,267,000 |  |  |  |  |  |  |  | 79,286,000 | 204,467,000 |  |  | 70,925,000 | 287,442,000 |  | 208,351,000 |  |  | 756,000,000 |
Business combination |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of existing ownership interest (at 25% ownership) |  |  | 4,164,000 |  |  |  | 12,914,000 |  |  |  |  |  |  |  |  | 91,542,000 |  | 139,326,000 |  |  |  |
Carrying value of investment | (974,258,000) | (1,098,560,000) | (2,296,000) |  |  |  |  |  |  |  |  |  |  |  |  | (33,382,000) |  | (23,597,000) |  |  |  |
Prior gain deferral recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,067,000 |  |  |  |  |  |
Gain on remeasurement | 115,729,000 |  | 1,868,000 | 1,868,000 | 1,734,000 | 1,734,000 |  |  |  |  |  |  |  |  |  | 84,227,000 | 84,227,000 | 115,729,000 | 115,729,000 |  |  |
Incremental revenue generated from acquired property |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,570,000 |  |  | 11,601,000 |  | 6,826,000 |  |  | 7,106,000
Incremental earnings (loss) of acquired property |  |  |  |  |  |  |  |  |  |  |  |  |  | (502,000) |  |  | 1,643,000 |  | 41,000 |  |  | (1,091,000)
Pro forma information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | 1,000,983,000 | 918,362,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 94,335,000 | $ 230,668,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of acquisition cost of a business combination allocated to liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 98-1 -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 Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -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. + Details
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- Definition The amount of acquisition cost of a business combination allocated to notes payables and long-term debt assumed from the acquired entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -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 Emerging Issues Task Force (EITF) -Number 98-1 -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 Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -Subparagraph g -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. + Details
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- Definition The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph g -Clause 3 -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. + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph r(1) -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. + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph r(1) -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. + Details
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- Definition In a business combination achieved in stages, this element represents the acquisition-date fair value of the equity interest in the acquiree held by the acquirer immediately before the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph q(1) -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. + Details
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- Definition In a business combination achieved in stages, this element represents the acquisition-date percentage of equity in the acquiree held by the acquirer immediately before the acquisition date. + References No definition available. + Details
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- Definition In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph q(2) -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 Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 48 -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. + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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. + Details
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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=16385135&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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: 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 Reference 4: 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. + Details
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