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Investments in Unconsolidated Joint Ventures: (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  | 3 Months Ended |  | 1 Months Ended | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011 | Mar. 31, 2012 Northwestern Mutual Life ("NML") | Mar. 31, 2011 Northwestern Mutual Life ("NML") | Dec. 31, 2011 Northwestern Mutual Life ("NML") | Dec. 31, 2011 SDG Macerich shoppingcenter | Mar. 31, 2012 Pacific Premier Retail LP | Mar. 31, 2011 Pacific Premier Retail LP | Dec. 31, 2011 Pacific Premier Retail LP | Mar. 31, 2012 Tysons Corner LLC | Mar. 31, 2011 Tysons Corner LLC | Dec. 31, 2011 Tysons Corner LLC | Mar. 31, 2012 Other Joint Ventures | Mar. 31, 2011 Other Joint Ventures
Assets of unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties, net | $ 4,216,255 |  | $ 4,328,953 |  |  |  |  |  |  |  |  |  |  |  |
Other assets | 481,189 |  | 469,039 |  |  |  |  |  |  |  |  |  |  |  |
Total assets | 4,697,444 |  | 4,797,992 |  |  |  |  | 1,089,513 |  | 1,078,226 | 345,584 |  | 339,324 |  |
Liabilities and partners' capital of unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable | 3,791,894 |  | 3,896,418 |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities | 148,348 |  | 161,827 |  |  |  |  |  |  |  |  |  |  |  |
Company's capital | 342,015 |  | 327,461 |  |  |  |  |  |  |  |  |  |  |  |
Outside partners' capital | 415,187 |  | 412,286 |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities and partners' capital | 4,697,444 |  | 4,797,992 |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's capital | 342,015 |  | 327,461 |  |  |  |  |  |  |  |  |  |  |  |
Basis adjustment | 693,654 |  | 700,414 |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures | 1,035,669 |  | 1,027,875 |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures | 1,098,859 |  | 1,098,560 |  |  |  |  |  |  |  |  |  |  |  |
Liabilities - Distributions in excess of investments in unconsolidated joint ventures | (63,190) |  | (70,685) |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures, net of distributions in excess of investments | 1,035,669 |  | 1,027,875 |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities |  |  |  |  |  |  |  | 1,005,684 |  | 1,005,479 | 319,786 |  | 319,247 |  |
Mortgage notes payable that could become recourse debt to the Company | 374,172 |  | 380,354 |  |  |  |  |  |  |  |  |  |  |  |
Indemnity of guaranteed amount | 179,512 |  | 182,638 |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable to affiliate |  |  |  | 660,739 |  | 663,543 |  |  |  |  |  |  |  |  |
Interest expense on borrowings from related party |  |  |  | 11,055 | 10,093 |  |  |  |  |  |  |  |  |  |
Amortization of difference between cost of investments and book value of underlying equity | (57) | 1,435 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues of unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum rents | 139,080 | 156,997 |  |  |  |  |  | 33,635 | 32,799 |  | 15,340 | 15,543 |  | 90,105 | 108,655
Percentage rents | 4,653 | 4,655 |  |  |  |  |  | 963 | 1,166 |  | 400 | 423 |  | 3,290 | 3,066
Tenant recoveries | 66,701 | 76,617 |  |  |  |  |  | 13,474 | 13,646 |  | 10,815 | 10,263 |  | 42,412 | 52,708
Other | 10,523 | 10,807 |  |  |  |  |  | 1,266 | 1,019 |  | 677 | 727 |  | 8,580 | 9,061
Total revenues | 220,957 | 249,076 |  |  |  |  |  | 49,338 | 48,630 |  | 27,232 | 26,956 |  | 144,387 | 173,490
Expenses of unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shopping center and operating expenses | 78,599 | 89,367 |  |  |  |  |  | 14,162 | 14,594 |  | 8,514 | 8,601 |  | 55,923 | 66,172
Interest expense | 55,432 | 65,629 |  |  |  |  |  | 13,288 | 11,723 |  | 3,021 | 3,973 |  | 39,123 | 49,933
Depreciation and amortization | 46,591 | 52,899 |  |  |  |  |  | 10,462 | 10,156 |  | 5,076 | 4,863 |  | 31,053 | 37,880
Total operating expenses | 180,622 | 207,895 |  |  |  |  |  | 37,912 | 36,473 |  | 16,611 | 17,437 |  | 126,099 | 153,985
Number of regional shopping centers owned in 50/50 partnership |  |  |  |  |  |  | 11 |  |  |  |  |  |  |  |
Ownership percentage in regional shopping centers before distribution and conveyance of interest in joint venture |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Ownership percentage in regional shopping centers |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Gain (loss) on sale or distribution of assets | 22,990 | 24,874 |  |  |  |  | 188,264 |  |  |  |  |  |  | 22,990 | 24,874
Net income | 63,325 | 66,055 |  |  |  |  |  | 11,426 | 12,157 |  | 10,621 | 9,519 |  | 41,278 | 44,379
Company's equity in net income | $ 30,618 | $ 30,275 |  |  |  |  |  | $ 5,810 | $ 6,183 |  | $ 4,047 | $ 3,708 |  | $ 20,761 | $ 20,384

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