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Investments in Unconsolidated Joint Ventures: (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Assets: |  |  |  |  |  |  |  |
Properties, net | $ 3,454,127 | [1] |  | $ 3,454,127 | [1] |  | $ 3,653,631 | [1]
Other assets | 316,985 | [1] |  | 316,985 | [1] |  | 411,862 | [1]
Total assets | 3,771,112 | [1] |  | 3,771,112 | [1] |  | 4,065,493 | [1]
Liabilities and partners' capital: |  |  |  |  |  |  |  |
Mortgage notes payable | 3,648,498 | [2] |  | 3,648,498 | [2] |  | 3,240,723 | [2]
Other liabilities | 196,927 |  |  | 196,927 |  |  | 148,711 |
Company's (deficit) capital | (72,153) |  |  | (72,153) |  |  | 304,477 |
Outside partners' (deficit) capital | (2,160) |  |  | (2,160) |  |  | 371,582 |
Total liabilities and partners' capital | 3,771,112 |  |  | 3,771,112 |  |  | 4,065,493 |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |
Company's (deficit) capital | (72,153) |  |  | (72,153) |  |  | 304,477 |
Basis adjustment | 521,151 | [3] |  | 521,151 | [3] |  | 516,833 | [3]
Assets—Investments in unconsolidated joint ventures | 706,450 |  |  | 706,450 |  |  | 974,258 |
Liabilities—Distributions in excess of investments in unconsolidated joint ventures | (257,452) |  |  | (257,452) |  |  | (152,948) |
Investments in unconsolidated joint ventures | 448,998 |  |  | 448,998 |  |  | 821,310 |
Mortgage notes payable that could become recourse debt to the Company | 47,040 |  |  | 47,040 |  |  | 51,171 |
Indemnity of guaranteed amount | 21,270 |  |  | 21,270 |  |  | 21,270 |
Amortization of difference between cost of investments and book value of underlying equity | 3,860 |  | 3,136 | 9,753 |  | 6,211 |  |
Revenues: |  |  |  |  |  |  |  |
Minimum rents | 102,710 |  | 124,374 | 319,175 |  | 397,560 |  |
Percentage rents | 3,498 |  | 5,284 | 10,065 |  | 13,968 |  |
Tenant recoveries | 51,780 |  | 63,094 | 156,841 |  | 196,761 |  |
Other | 9,739 |  | 11,171 | 32,983 |  | 33,404 |  |
Total revenues | 167,727 |  | 203,923 | 519,064 |  | 641,693 |  |
Expenses: |  |  |  |  |  |  |  |
Shopping center and operating expenses | 57,975 |  | 69,988 | 174,654 |  | 224,233 |  |
Interest expense | 35,114 |  | 48,080 | 107,051 |  | 157,091 |  |
Depreciation and amortization | 36,323 |  | 44,783 | 112,004 |  | 138,419 |  |
Total operating expenses | 129,412 |  | 162,851 | 393,709 |  | 519,743 |  |
Gain (loss) on remeasurement, sale or write down of assets, net | 38,104 |  | (28) | 183,154 |  | 22,938 |  |
Gain on early extinguishment of debt | 14 |  |  | 14 |  |  |  |
Net income | 76,433 |  | 41,044 | 308,523 |  | 144,888 |  |
Company's equity in net income | 35,161 |  | 19,315 | 145,477 |  | 68,624 |  |
Northwestern Mutual Life (NML) |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |
Mortgage notes payable to affiliate | 715,332 |  |  | 715,332 |  |  | 436,857 |
Interest expense on borrowings from related party | 7,920 |  | 10,980 | 21,717 |  | 32,974 |  |
Pacific Premier Retail LP |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Total assets | 776,186 |  |  | 776,186 |  |  | 1,039,742 |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |
Total liabilities | 818,222 |  |  | 818,222 |  |  | 942,370 |
Revenues: |  |  |  |  |  |  |  |
Minimum rents | 27,426 |  | 32,718 | 91,779 |  | 98,812 |  |
Percentage rents | 572 |  | 837 | 2,155 |  | 2,571 |  |
Tenant recoveries | 12,115 |  | 14,091 | 40,555 |  | 41,967 |  |
Other | 1,086 |  | 1,138 | 3,980 |  | 3,665 |  |
Total revenues | 41,199 |  | 48,784 | 138,469 |  | 147,015 |  |
Expenses: |  |  |  |  |  |  |  |
Shopping center and operating expenses | 12,231 |  | 15,075 | 40,948 |  | 43,385 |  |
Interest expense | 10,251 |  | 12,904 | 33,118 |  | 39,405 |  |
Depreciation and amortization | 9,067 |  | 10,905 | 30,697 |  | 31,926 |  |
Total operating expenses | 31,549 |  | 38,884 | 104,763 |  | 114,716 |  |
Gain (loss) on remeasurement, sale or write down of assets, net | 38,432 |  | 0 | 182,781 |  | (10) |  |
Gain on early extinguishment of debt | 0 |  |  | 0 |  |  |  |
Net income | 48,082 |  | 9,900 | 216,487 |  | 32,289 |  |
Company's equity in net income | 21,567 |  | 5,035 | 105,684 |  | 16,422 |  |
Tysons Corner LLC |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Total assets | 467,632 |  |  | 467,632 |  |  | 409,622 |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |
Total liabilities | 337,804 |  |  | 337,804 |  |  | 329,145 |
Revenues: |  |  |  |  |  |  |  |
Minimum rents | 15,344 |  | 15,847 | 46,526 |  | 47,149 |  |
Percentage rents | (12) |  | 233 | 734 |  | 866 |  |
Tenant recoveries | 11,304 |  | 11,340 | 34,025 |  | 32,969 |  |
Other | 510 |  | 618 | 2,080 |  | 1,964 |  |
Total revenues | 27,146 |  | 28,038 | 83,365 |  | 82,948 |  |
Expenses: |  |  |  |  |  |  |  |
Shopping center and operating expenses | 9,818 |  | 8,760 | 26,819 |  | 25,834 |  |
Interest expense | 3,801 |  | 2,838 | 7,825 |  | 8,902 |  |
Depreciation and amortization | 4,568 |  | 5,094 | 13,499 |  | 15,279 |  |
Total operating expenses | 18,187 |  | 16,692 | 48,143 |  | 50,015 |  |
Gain (loss) on remeasurement, sale or write down of assets, net | 0 |  | 0 | 0 |  | 0 |  |
Gain on early extinguishment of debt | 14 |  |  | 14 |  |  |  |
Net income | 8,973 |  | 11,346 | 35,236 |  | 32,933 |  |
Company's equity in net income | 2,919 |  | 4,372 | 12,957 |  | 12,721 |  |
Other Joint Ventures |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |
Minimum rents | 59,940 |  | 75,809 | 180,870 |  | 251,599 |  |
Percentage rents | 2,938 |  | 4,214 | 7,176 |  | 10,531 |  |
Tenant recoveries | 28,361 |  | 37,663 | 82,261 |  | 121,825 |  |
Other | 8,143 |  | 9,415 | 26,923 |  | 27,775 |  |
Total revenues | 99,382 |  | 127,101 | 297,230 |  | 411,730 |  |
Expenses: |  |  |  |  |  |  |  |
Shopping center and operating expenses | 35,926 |  | 46,153 | 106,887 |  | 155,014 |  |
Interest expense | 21,062 |  | 32,338 | 66,108 |  | 108,784 |  |
Depreciation and amortization | 22,688 |  | 28,784 | 67,808 |  | 91,214 |  |
Total operating expenses | 79,676 |  | 107,275 | 240,803 |  | 355,012 |  |
Gain (loss) on remeasurement, sale or write down of assets, net | (328) |  | (28) | 373 |  | 22,948 |  |
Gain on early extinguishment of debt | 0 |  |  | 0 |  |  |  |
Net income | 19,378 |  | 19,798 | 56,800 |  | 79,666 |  |
Company's equity in net income | $ 10,675 |  | $ 9,908 | $ 26,836 |  | $ 39,481 |  |
[1] | These amounts include the assets and liabilities of the following joint ventures as of September 30, 2013 and December 31, 2012: PacificPremierRetail LP TysonsCorner LLCAs of September 30, 2013: Total Assets$776,186 $467,632Total Liabilities$818,222 $337,804As of December 31, 2012: Total Assets$1,039,742 $409,622Total Liabilities$942,370 $329,145
[2] | Certain mortgage notes payable could become recourse debt to the Company should the joint venture be unable to discharge the obligations of the related debt. As of September 30, 2013 and December 31, 2012, a total of $47,040 and $51,171, respectively, could become recourse debt to the Company. As of September 30, 2013 and December 31, 2012, the Company had indemnity agreements from joint venture partners for $21,270 of the guaranteed amount.Included in mortgage notes payable are amounts due to affiliates of Northwestern Mutual Life ("NML") of $715,332 and $436,857 as of September 30, 2013 and December 31, 2012, respectively. NML is considered a related party because it is a joint venture partner with the Company in Macerich Northwestern Associates—Broadway Plaza. Interest expense incurred on these borrowings amounted to $7,920 and $10,980 for the three months ended September 30, 2013 and 2012, respectively, and $21,717 and $32,974 for the nine months ended September 30, 2013 and 2012, respectively.
[3] | The Company amortizes the difference between the cost of its investments in unconsolidated joint ventures and the book value of the underlying equity into income on a straight-line basis consistent with the lives of the underlying assets. The amortization of this difference was $3,860 and $3,136 for the three months ended September 30, 2013 and 2012, respectively, and $9,753 and $6,211 for the nine months ended September 30, 2013 and 2012, respectively.

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- Definition The amount of net income (loss) reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33912-111571 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph bb -Article 1 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph g -Subparagraph 1, 2 -Article 4 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph w -Article 1 + Details
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