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Investments in Unconsolidated Joint Ventures: (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011 | Jun. 30, 2012 Northwestern Mutual Life ("NML") | Jun. 30, 2011 Northwestern Mutual Life ("NML") | Jun. 30, 2012 Northwestern Mutual Life ("NML") | Jun. 30, 2011 Northwestern Mutual Life ("NML") | Dec. 31, 2011 Northwestern Mutual Life ("NML") | Dec. 31, 2011 SDG Macerich shoppingcenter | Jun. 30, 2012 Pacific Premier Retail LP | Jun. 30, 2011 Pacific Premier Retail LP | Jun. 30, 2012 Pacific Premier Retail LP | Jun. 30, 2011 Pacific Premier Retail LP | Dec. 31, 2011 Pacific Premier Retail LP | Jun. 30, 2012 Tysons Corner LLC | Jun. 30, 2011 Tysons Corner LLC | Jun. 30, 2012 Tysons Corner LLC | Jun. 30, 2011 Tysons Corner LLC | Dec. 31, 2011 Tysons Corner LLC | Jun. 30, 2012 Other Joint Ventures | Jun. 30, 2011 Other Joint Ventures | Jun. 30, 2012 Other Joint Ventures | Jun. 30, 2011 Other Joint Ventures
Assets of unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties, net | $ 4,220,133 |  | $ 4,220,133 |  | $ 4,328,953 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets | 450,504 |  | 450,504 |  | 469,039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | 4,670,637 |  | 4,670,637 |  | 4,797,992 |  |  |  |  |  |  | 1,051,404 |  | 1,051,404 |  | 1,078,226 | 360,989 |  | 360,989 |  | 339,324 |  |  |  |
Liabilities and partners' capital of unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable | 3,756,725 |  | 3,756,725 |  | 3,896,418 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities | 149,947 |  | 149,947 |  | 161,827 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's capital | 356,121 |  | 356,121 |  | 327,461 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside partners' capital | 407,844 |  | 407,844 |  | 412,286 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities and partners' capital | 4,670,637 |  | 4,670,637 |  | 4,797,992 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's capital | 356,121 |  | 356,121 |  | 327,461 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis adjustment | 685,498 |  | 685,498 |  | 700,414 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures | 1,041,619 |  | 1,041,619 |  | 1,027,875 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures | 1,120,832 |  | 1,120,832 |  | 1,098,560 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities - Distributions in excess of investments in unconsolidated joint ventures | (79,213) |  | (79,213) |  | (70,685) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures, net of distributions in excess of investments | 1,041,619 |  | 1,041,619 |  | 1,027,875 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities |  |  |  |  |  |  |  |  |  |  |  | 1,000,565 |  | 1,000,565 |  | 1,005,479 | 327,057 |  | 327,057 |  | 319,247 |  |  |  |
Mortgage notes payable that could become recourse debt to the Company | 372,371 |  | 372,371 |  | 380,354 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indemnity of guaranteed amount | 178,639 |  | 178,639 |  | 182,638 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable to affiliate |  |  |  |  |  | 657,889 |  | 657,889 |  | 663,543 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense on borrowings from related party |  |  |  |  |  | 10,939 | 10,004 | 21,994 | 20,097 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of difference between cost of investments and book value of underlying equity | 3,132 | 2,612 | 3,075 | 4,119 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues of unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum rents | 134,106 | 153,741 | 273,186 | 310,738 |  |  |  |  |  |  |  | 32,459 | 32,545 | 66,094 | 65,344 |  | 15,962 | 14,786 | 31,302 | 30,329 |  | 85,685 | 106,410 | 175,790 | 215,065
Percentage rents | 4,031 | 4,294 | 8,684 | 8,949 |  |  |  |  |  |  |  | 771 | 936 | 1,734 | 2,102 |  | 233 | 445 | 633 | 868 |  | 3,027 | 2,913 | 6,317 | 5,979
Tenant recoveries | 66,966 | 76,100 | 133,667 | 152,717 |  |  |  |  |  |  |  | 14,402 | 13,621 | 27,876 | 27,267 |  | 10,814 | 10,215 | 21,629 | 20,478 |  | 41,750 | 52,264 | 84,162 | 104,972
Other | 11,710 | 11,535 | 22,233 | 22,342 |  |  |  |  |  |  |  | 1,261 | 1,037 | 2,527 | 2,056 |  | 669 | 703 | 1,346 | 1,430 |  | 9,780 | 9,795 | 18,360 | 18,856
Total revenues | 216,813 | 245,670 | 437,770 | 494,746 |  |  |  |  |  |  |  | 48,893 | 48,139 | 98,231 | 96,769 |  | 27,678 | 26,149 | 54,910 | 53,105 |  | 140,242 | 171,382 | 284,629 | 344,872
Expenses of unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shopping center and operating expenses | 75,646 | 88,492 | 154,245 | 177,859 |  |  |  |  |  |  |  | 14,148 | 14,612 | 28,310 | 29,206 |  | 8,560 | 8,081 | 17,074 | 16,682 |  | 52,938 | 65,799 | 108,861 | 131,971
Interest expense | 53,579 | 63,391 | 109,011 | 129,020 |  |  |  |  |  |  |  | 13,213 | 11,701 | 26,501 | 23,424 |  | 3,043 | 3,845 | 6,064 | 7,818 |  | 37,323 | 47,845 | 76,446 | 97,778
Depreciation and amortization | 47,045 | 53,181 | 93,636 | 106,080 |  |  |  |  |  |  |  | 10,559 | 10,325 | 21,021 | 20,481 |  | 5,109 | 5,043 | 10,185 | 9,906 |  | 31,377 | 37,813 | 62,430 | 75,693
Total operating expenses | 176,270 | 205,064 | 356,892 | 412,959 |  |  |  |  |  |  |  | 37,920 | 36,638 | 75,832 | 73,111 |  | 16,712 | 16,969 | 33,323 | 34,406 |  | 121,638 | 151,457 | 247,737 | 305,442
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on sale or remeasurement of assets | (24) | (329) | 22,966 | 24,545 |  |  |  |  |  |  |  | (10) |  | (10) |  |  |  |  |  |  |  | (14) | (329) | 22,976 | 24,545
Gain on extinguishment of debt |  | 15,506 |  | 15,506 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,506 |  | 15,506
Net income | 40,519 | 55,783 | 103,844 | 121,838 |  |  |  |  |  |  |  | 10,963 | 11,501 | 22,389 | 23,658 |  | 10,966 | 9,180 | 21,587 | 18,699 |  | 18,590 | 35,102 | 59,868 | 79,481
Company's equity in net income | $ 18,691 | $ 25,207 | $ 49,309 | $ 55,482 |  |  |  |  |  |  |  | $ 5,577 | $ 5,850 | $ 11,387 | $ 12,033 |  | $ 4,302 | $ 3,490 | $ 8,349 | $ 7,198 |  | $ 8,812 | $ 15,867 | $ 29,573 | $ 36,251

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