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Investments in Unconsolidated Joint Ventures: (Details 3) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Northwestern Mutual Life ("NML") | Dec. 31, 2011 Northwestern Mutual Life ("NML") | Dec. 31, 2010 Northwestern Mutual Life ("NML") | Dec. 31, 2011 SDG Macerich Properties, L. P. | Dec. 31, 2011 SDG Macerich Properties, L. P. | Dec. 31, 2010 SDG Macerich Properties, L. P. | Dec. 31, 2012 Pacific Premier Retail LP | Dec. 31, 2011 Pacific Premier Retail LP | Dec. 31, 2010 Pacific Premier Retail LP | Dec. 31, 2012 Tysons Corner LLC | Dec. 31, 2011 Tysons Corner LLC | Dec. 31, 2010 Tysons Corner LLC | Dec. 31, 2012 Other Joint Ventures | Dec. 31, 2011 Other Joint Ventures | Dec. 31, 2010 Other Joint Ventures
Assets of unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties, net | $ 3,653,631 | $ 4,328,953 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets | 411,862 | 469,039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | 4,065,493 | 4,797,992 |  |  |  |  |  |  |  | 1,039,742 | 1,078,226 |  | 409,622 | 339,324 |  |  |  |
Liabilities and partners' capital of unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable | 3,240,723 | 3,896,418 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities | 148,711 | 161,827 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's capital | 304,477 | 327,461 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside partners' capital | 371,582 | 412,286 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities and partners' capital | 4,065,493 | 4,797,992 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's capital | 304,477 | 327,461 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis adjustment | 516,833 | 700,414 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures | 821,310 | 1,027,875 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures | 974,258 | 1,098,560 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities - Distributions in excess of investments in unconsolidated joint ventures | (152,948) | (70,685) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures, net of distributions in excess of investments | 821,310 | 1,027,875 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities |  |  |  |  |  |  |  |  |  | 942,370 | 1,005,479 |  | 329,145 | 319,247 |  |  |  |
Mortgage notes payable that could become recourse debt to the Company | 51,171 | 380,354 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indemnity of guaranteed amount | 21,270 | 182,638 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable to affiliate |  |  |  | 436,857 | 663,543 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense on borrowings from related party |  |  |  | 43,732 | 42,451 | 40,876 |  |  |  |  |  |  |  |  |  |  |  |
Amortization of difference between cost of investments and book value of underlying equity | 15,480 | 9,257 | 7,327 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues of unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum rents | 512,002 | 633,646 | 635,347 |  |  |  |  | 84,523 | 90,187 | 132,247 | 133,191 | 131,204 | 63,569 | 63,950 | 59,587 | 316,186 | 351,982 | 354,369
Percentage rents | 23,087 | 31,425 | 28,885 |  |  |  |  | 4,742 | 4,411 | 5,390 | 6,124 | 5,487 | 1,929 | 2,068 | 1,585 | 15,768 | 18,491 | 17,402
Tenant recoveries | 250,168 | 309,735 | 316,788 |  |  |  |  | 43,845 | 44,651 | 56,397 | 55,088 | 50,626 | 44,225 | 41,286 | 38,162 | 149,546 | 169,516 | 183,349
Other | 46,239 | 49,720 | 44,744 |  |  |  |  | 3,668 | 3,653 | 5,650 | 5,248 | 6,688 | 3,341 | 3,061 | 2,975 | 37,248 | 37,743 | 31,428
Total revenues | 831,496 | 1,024,526 | 1,025,764 |  |  |  |  | 136,778 | 142,902 | 199,684 | 199,651 | 194,005 | 113,064 | 110,365 | 102,309 | 518,748 | 577,732 | 586,548
Expenses of unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shopping center and operating expenses | 287,234 | 364,260 | 366,668 |  |  |  |  | 51,037 | 51,004 | 59,329 | 59,723 | 55,680 | 35,244 | 34,519 | 32,025 | 192,661 | 218,981 | 227,959
Interest expense | 199,916 | 260,093 | 270,305 |  |  |  |  | 41,300 | 46,530 | 52,139 | 50,174 | 51,796 | 11,481 | 14,237 | 16,204 | 136,296 | 154,382 | 155,775
Depreciation and amortization | 177,997 | 215,667 | 210,664 |  |  |  |  | 27,837 | 30,796 | 43,031 | 41,448 | 38,928 | 19,798 | 20,115 | 18,745 | 115,168 | 126,267 | 122,195
Total operating expenses | 665,147 | 840,020 | 847,637 |  |  |  |  | 120,174 | 128,330 | 154,499 | 151,345 | 146,404 | 66,523 | 68,871 | 66,974 | 444,125 | 499,630 | 505,929
Gain on sale or distribution of assets | 29,301 | 389,707 | 576 |  |  |  | 188,264 | 366,312 | 6 | 90 |  | 468 |  |  |  | 29,211 | 23,395 | 102
Gain (loss) on early extinguishment of debt |  | 15,704 | (1,352) |  |  |  |  | 15,704 |  |  |  | (1,352) |  |  |  |  |  |
Net income | 195,650 | 589,917 | 177,351 |  |  |  |  | 398,620 | 14,578 | 45,275 | 48,306 | 46,717 | 46,541 | 41,494 | 35,335 | 103,834 | 101,497 | 80,721
Company's equity in net income | $ 79,281 | $ 294,677 | $ 79,529 |  |  |  |  | $ 204,439 | $ 7,290 | $ 23,026 | $ 24,568 | $ 23,972 | $ 17,969 | $ 16,209 | $ 13,917 | $ 38,286 | $ 49,461 | $ 34,350

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