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Mortgage Notes Payable: (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |  |  | 9 Months Ended |  | 0 Months Ended |  |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |  |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 0 Months Ended |  |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 9 Months Ended |  |  |  | 0 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Sep. 30, 2013 Arrowhead Towne Center | Dec. 31, 2012 Arrowhead Towne Center | Sep. 30, 2013 Camelback Colonnade | Dec. 31, 2012 Camelback Colonnade | Sep. 30, 2013 Chandler Fashion Center | Dec. 31, 2012 Chandler Fashion Center | Sep. 30, 2013 Chesterfield Towne Center | Dec. 31, 2012 Chesterfield Towne Center | Sep. 30, 2013 Danbury Fair Mall | Dec. 31, 2012 Danbury Fair Mall | Sep. 30, 2013 Deptford Mall One | Dec. 31, 2012 Deptford Mall One | Sep. 30, 2013 Deptford Mall Two | Dec. 31, 2012 Deptford Mall Two | Sep. 30, 2013 Eastland Mall | Dec. 31, 2012 Eastland Mall | Sep. 30, 2013 Fashion Outlets of Chicago | Dec. 31, 2012 Fashion Outlets of Chicago | Sep. 30, 2013 Fashion Outlets of Niagara Falls USA | Dec. 31, 2012 Fashion Outlets of Niagara Falls USA | Sep. 30, 2013 Fiesta Mall | Dec. 31, 2012 Fiesta Mall | Sep. 30, 2013 Flagstaff Mall | Dec. 31, 2012 Flagstaff Mall | Aug. 01, 2013 FlatIron Crossing | Sep. 30, 2013 FlatIron Crossing | Dec. 31, 2012 FlatIron Crossing | Sep. 30, 2013 Freehold Raceway Mall | Dec. 31, 2012 Freehold Raceway Mall | Sep. 30, 2013 Fresno Fashion Fair | Dec. 31, 2012 Fresno Fashion Fair | Sep. 30, 2013 Great Northern Mall | Dec. 31, 2012 Great Northern Mall | Sep. 30, 2013 Green Acres Mall | Dec. 31, 2012 Green Acres Mall | Sep. 30, 2013 Kings Plaza | Dec. 31, 2012 Kings Plaza | Sep. 30, 2013 The Mall at Northgate | Dec. 31, 2012 The Mall at Northgate | Sep. 30, 2013 The Oaks | Dec. 31, 2012 The Oaks | Sep. 30, 2013 Pacific View | Dec. 31, 2012 Pacific View | Sep. 30, 2013 Paradise Valley Mall | Dec. 31, 2012 Paradise Valley Mall | Sep. 30, 2013 Promenade at Casa Grande | Dec. 31, 2012 Promenade at Casa Grande | Sep. 30, 2013 Promenade at Casa Grande Low end of range | Sep. 30, 2013 Promenade at Casa Grande High end of range | Sep. 30, 2013 Salisbury Center | Dec. 31, 2012 Salisbury Center | Sep. 30, 2013 Santa Monica Place | Dec. 31, 2012 Santa Monica Place | May 30, 2013 SanTan Village Regional Center | Sep. 30, 2013 SanTan Village Regional Center | Dec. 31, 2012 SanTan Village Regional Center | Sep. 30, 2013 South Plains Mall | Dec. 31, 2012 South Plains Mall | Apr. 30, 2013 South Towne center | Sep. 30, 2013 South Towne center | Dec. 31, 2012 South Towne center | Sep. 30, 2013 Towne Mall | Dec. 31, 2012 Towne Mall | Sep. 30, 2013 Tucson La Encantada | Dec. 31, 2012 Tucson La Encantada | Sep. 30, 2013 Twenty Ninth Street | Dec. 31, 2012 Twenty Ninth Street | Sep. 30, 2013 Valley Mall | Dec. 31, 2012 Valley Mall | Sep. 30, 2013 Valley River Center | Dec. 31, 2012 Valley River Center | Sep. 30, 2013 Mall of Victor Valley | Dec. 31, 2012 Mall of Victor Valley | Apr. 30, 2013 Vintage Faire Mall | Sep. 30, 2013 Vintage Faire Mall | Dec. 31, 2012 Vintage Faire Mall | Sep. 30, 2013 Westside Pavilion | Dec. 31, 2012 Westside Pavilion | Sep. 30, 2013 Wilton Mall | Dec. 31, 2012 Wilton Mall | Sep. 30, 2009 Freehold Raceway Mall and Chandler Fashion Center | Jan. 31, 2013 Green Acres Mall | Jan. 24, 2013 Green Acres Mall sqft | Jan. 03, 2013 Kings Plaza | Nov. 28, 2012 Kings Plaza sqft
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,792,000 |  | 1,199,000
Percentage of oan assumed by third party (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.90% |  |  |  |
Carrying amount of mortgage notes, related party | $ 270,715 | [1] |  |  | $ 270,715 | [1] |  | $ 274,609 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1],[2] | $ 0 | [1],[2] | $ 0 | [1],[3] | $ 0 | [1],[3] | $ 0 | [1] | $ 0 | [1] | $ 117,810 | [1] | $ 119,823 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1],[4] | $ 0 | [1],[4] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1],[5] | $ 0 | [1],[5] | $ 0 | [1] | $ 0 | [1] |  | $ 0 | [1],[6] | $ 0 | [1],[6] | $ 0 | [1],[3] | $ 0 | [1],[3] | $ 79,701 | [1] | $ 80,601 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1],[7] | $ 0 | [1],[7] | $ 0 | [1],[8] | $ 0 | [1],[8] | $ 0 | [1],[9] | $ 0 | [1],[9] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1],[10] | $ 0 | [1],[10] | $ 0 | [1],[11] | $ 0 | [1],[11] |  |  | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] |  | $ 0 | [1],[12] | $ 0 | [1],[12] | $ 0 | [1] | $ 0 | [1] |  | $ 0 | [1],[13] | $ 0 | [1],[13] | $ 0 | [1] | $ 0 | [1] | $ 73,204 | [1] | $ 74,185 | [1] | $ 0 | [1],[14] | $ 0 | [1],[14] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1],[15] | $ 0 | [1],[15] |  | $ 0 | [1],[13] | $ 0 | [1],[13] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1],[16] | $ 0 | [1],[16] |  |  |  |  |
Carrying amount of mortgage notes, other | 4,209,900 | [1] |  |  | 4,209,900 | [1] |  | 4,162,734 | [1] | 237,832 | [1] | 243,176 | [1] | 49,416 | [1],[2] | 0 | [1],[2] | 200,000 | [1],[3] | 200,000 | [1],[3] | 110,000 | [1] | 110,000 | [1] | 117,809 | [1] | 119,823 | [1] | 202,556 | [1] | 205,000 | [1] | 14,616 | [1] | 14,800 | [1] | 168,000 | [1] | 168,000 | [1] | 81,472 | [1],[4] | 9,165 | [1],[4] | 124,682 | [1] | 126,584 | [1] | 0 | [1],[5] | 84,000 | [1],[5] | 37,000 | [1] | 37,000 | [1] |  | 0 | [1],[6] | 173,561 | [1],[6] | 232,900 | [1],[3] | 232,900 | [1],[3] | 79,701 | [1] | 80,602 | [1] | 35,719 | [1] | 36,395 | [1] | 321,407 | [1],[7] | 0 | [1],[7] | 492,954 | [1],[8] | 354,000 | [1],[8] | 64,000 | [1],[9] | 64,000 | [1],[9] | 215,224 | [1] | 218,119 | [1] | 136,478 | [1] | 138,367 | [1] | 0 | [1],[10] | 81,000 | [1],[10] | 64,226 | [1],[11] | 73,700 | [1],[11] |  |  | 115,000 | [1] | 115,000 | [1] | 236,701 | [1] | 240,000 | [1] |  | 137,321 | [1],[12] | 138,087 | [1],[12] | 100,221 | [1] | 101,340 | [1] |  | 0 | [1],[13] | 85,247 | [1],[13] | 23,092 | [1] | 23,369 | [1] | 0 | [1] | 0 | [1] | 107,000 | [1],[14] | 107,000 | [1],[14] | 42,345 | [1] | 42,891 | [1] | 120,000 | [1] | 120,000 | [1] | 90,000 | [1],[15] | 90,000 | [1],[15] |  | 99,431 | [1],[13] | 135,000 | [1],[13] | 152,797 | [1] | 154,608 | [1] | 0 | [1],[16] | 40,000 | [1],[16] |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 2.76% | [17] |  |  | 2.16% | [12],[17] |  |  | 3.77% | [17],[3] |  |  | 4.80% | [17] |  |  | 5.53% | [17] |  |  | 3.76% | [17] |  |  | 6.46% | [17] |  |  | 5.79% | [17] |  |  | 2.98% | [17],[4] | 3.00% |  | 4.89% | [17] |  |  |  |  |  |  | 5.03% | [17] |  |  |  |  |  |  |  | 4.20% | [17],[3] |  |  | 6.76% | [17] |  |  | 5.19% | [17] |  |  | 3.61% | [17],[7] |  |  | 3.67% | [17],[8] |  |  | 3.06% | [17],[9] | 3.09% |  | 4.14% | [17] |  |  | 4.08% | [17] |  |  |  |  |  |  | 5.21% | [11],[17] | 5.21% | [11],[17] |  |  | 5.83% | [17] |  |  | 2.99% | [17] |  |  |  | 3.14% | [12],[17] |  |  | 6.58% | [17] |  |  |  |  |  |  |  | 4.48% | [17] |  |  | 4.23% | [17] |  |  | 3.02% | [14],[17] | 3.04% |  | 5.85% | [17] |  |  | 5.59% | [17] |  |  | 2.74% | [15],[17] | 2.12% |  | 2.50% | 5.81% | [13],[17] |  |  | 4.49% | [17] |  |  |  |  |  |  |  |  |  |  |
Monthly debt service |  |  |  |  |  |  |  |  |  | 1,131 | [18] |  |  | 178 | [18],[2] |  |  | 625 | [18],[3] |  |  | 573 | [18] |  |  | 1,538 | [18] |  |  | 947 | [18] |  |  | 101 | [18] |  |  | 811 | [18] |  |  | 182 | [18],[4] |  |  | 727 | [18] |  |  |  |  |  |  | 151 | [18] |  |  |  |  |  |  |  | 805 | [18],[3] |  |  | 1,104 | [18] |  |  | 234 | [18] |  |  | 1,447 | [18],[7] |  |  | 2,229 | [18],[8] |  |  | 130 | [18],[9] |  |  | 1,064 | [18] |  |  | 668 | [18] |  |  |  |  |  |  | 245 | [11],[18] |  |  |  |  | 555 | [18] |  |  | 1,004 | [18] |  |  |  | 589 | [12],[18] |  |  | 648 | [18] |  |  |  |  |  |  |  | 117 | [18] |  |  | 368 | [18] |  |  | 251 | [14],[18] |  |  | 280 | [18] |  |  | 558 | [18] |  |  | 183 | [15],[18] |  |  |  | 586 | [13],[18] |  |  | 783 | [18] |  |  |  |  |  |  |  |  |  |  |
Debt premiums |  |  |  |  |  |  |  |  |  | 15,411 |  | 17,716 |  | 2,416 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,574 |  | 7,270 |  |  |  |  |  |  |  |  |  |  | 0 |  | 5,232 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (15) |  | (19) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5) |  | (28) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (241) |  | (307) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt premiums (discounts), net | 24,140 |  |  |  | 24,140 |  |  | 29,864 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable, maximum borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 325,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt | (6) |  | 0 |  | 1,938 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,791 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (853) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate basis (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread over basis (as a percent) |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.63% |  |  |  |  |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate floor (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable which could become recourse | 205,555 |  |  |  | 205,555 |  |  | 213,466 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantee amounts for indemnity agreements from consolidated joint venture partners | 21,263 |  |  |  | 21,263 |  |  | 28,208 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense capitalized | 2,887 |  |  | 2,984 | 8,227 |  | 7,899 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of mortgage notes payable | 4,558,549 |  |  |  | 4,558,549 |  |  | 4,567,658 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of loan maturities expected to be refinanced, restructured, extended or paid-off |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of additional borrowing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 140,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 138,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,200 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 225,000 | $ 100,000 | $ 146,000 | $ 354,000
[1] | The mortgage notes payable balances include the unamortized debt premiums (discounts). Debt premiums (discounts) represent the excess (deficiency) of the fair value of debt over (under) the principal value of debt assumed in various acquisitions and are amortized to interest expense over the remaining term of the related debt in a manner that approximates the effective interest method.Debt premiums (discounts) consist of the following:Property Pledged as CollateralSeptember 30, 2013 December 31, 2012Arrowhead Towne Center$15,411 $17,716Camelback Colonnade2,416 —Deptford Mall(15) (19)Fashion Outlets of Niagara Falls USA6,574 7,270FlatIron Crossing— 5,232Great Northern Mall(5) (28)Valley Mall(241) (307) $24,140 $29,864
[2] | On September 17, 2013, the Company obtained control of the consolidated joint venture as a result of the Camelback Colonnade Restructuring (See Note 14—Acquisitions). The loan on the property bears interest at an effective rate of 2.16% and matures on October 12, 2015.
[3] | A 49.9% interest in the loan has been assumed by a third party in connection with a co-venture arrangement (See Note 11—Co-Venture Arrangement).
[4] | The construction loan on the property allows for borrowings up to $140,000, bears interest at LIBOR plus 2.50% and matures on March 5, 2017, including extension options. At September 30, 2013 and December 31, 2012, the total interest rate was 2.98% and 3.00%, respectively.
[5] | On September 30, 2013, the Company conveyed the property to the lender by a deed-in-lieu of foreclosure. As a result, the Company has been discharged from this non-recourse loan (See Note 15—Discontinued Operations).
[6] | On June 4, 2013, the loan was paid off in full, which resulted in a gain of $2,791 on the early extinguishment of debt.
[7] | On January 24, 2013, in connection with the Company's acquisition of Green Acres Mall (See Note 14—Acquisitions), the Company placed a new loan on the property that allowed for borrowings of up to $325,000, bears interest at an effective interest rate of 3.61% and matures on February 3, 2021. Concurrent with the acquisition, the Company borrowed $100,000 on the loan. On January 31, 2013, the Company exercised its option to borrow an additional $225,000 on the loan.
[8] | On January 3, 2013, the Company exercised its option to borrow an additional $146,000 on the loan.
[9] | The loan bears interest at LIBOR plus 2.25% and matures on March 1, 2017. At September 30, 2013 and December 31, 2012, the total interest rate was 3.06% and 3.09%, respectively.
[10] | On August 26, 2013, the loan was paid off in full
[11] | The loan bears interest at LIBOR plus 4.0% with a LIBOR rate floor of 0.50% and matures on December 30, 2013. At September 30, 2013 and December 31, 2012, the total interest rate was 5.21%.
[12] | On May 30, 2013, the consolidated joint venture replaced the existing loan on the property with a new $138,000 loan that bears interest at 3.14% and matures on June 1, 2019.
[13] | On April 30, 2013, the existing loan on Vintage Faire Mall was paid off in full, resulting in a loss of $853 on the early extinguishment of debt. Concurrently, the loan on South Towne Center was assumed by Vintage Faire Mall. An additional $15,200 loan was added to the assumed loan that bears interest at 2.50% and matures on November 5, 2015.
[14] | The loan bears interest at LIBOR plus 2.63% and matures on January 18, 2016. At September 30, 2013 and December 31, 2012, the total interest rate was 3.02% and 3.04%, respectively.
[15] | The loan bears interest at LIBOR plus 2.25% and matures on November 6, 2014. At September 30, 2013 and December 31, 2012, the total interest rate was 2.74% and 2.12%, respectively.
[16] | On August 1, 2013, the loan was paid off in full
[17] | The interest rate disclosed represents the effective interest rate, including the debt premiums (discounts) and deferred finance costs.
[18] | The monthly debt service represents the payment of principal and interest.

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