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Investments in Unconsolidated Joint Ventures: (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Oct. 03, 2012 FlatIron Crossing sqft | Oct. 26, 2012 Arrowhead Towne Center sqft | Mar. 30, 2012 Chandler Village Center, LLC sqft | Sep. 30, 2012 Chandler Village Center, LLC | Mar. 30, 2012 Chandler Festival sqft | Sep. 30, 2012 Chandler Festival | Mar. 30, 2012 SanTan Village Power Center sqft | Sep. 30, 2012 SanTan Village Power Center | May 31, 2012 Chandler Gateway sqft | Sep. 30, 2012 Chandler Gateway | Aug. 10, 2012 NorthPark Center sqft | Sep. 30, 2013 Pacific Premier Retail LP | Sep. 30, 2012 Pacific Premier Retail LP | Sep. 30, 2013 Pacific Premier Retail LP | Sep. 30, 2012 Pacific Premier Retail LP | Sep. 17, 2013 Camelback Colonnade | Sep. 16, 2013 Camelback Colonnade | Sep. 30, 2013 Redmond Town Center | Aug. 01, 2013 Redmond Town Center Pacific Premier Retail LP sqft | May 29, 2013 Redmond Town Center Pacific Premier Retail LP sqft | Sep. 30, 2013 Redmond Town Center Pacific Premier Retail LP | Sep. 30, 2013 Redmond Town Center Pacific Premier Retail LP | Jun. 12, 2013 Kitsap Mall Pacific Premier Retail LP sqft | Sep. 30, 2013 Kitsap Mall Pacific Premier Retail LP
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest sold |  |  |  |  |  |  | 50.00% |  | 50.00% |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on remeasurement, sale or write down of assets, net | $ 38,104 | $ (28) | $ 183,154 | $ 22,938 |  |  |  |  |  |  | $ 23,294 |  |  |  |  | $ 38,432 | $ 0 | $ 182,781 | $ (10) |  |  |  | $ 38,471 | $ 89,155 |  |  | $ 55,155 |
Proceeds from sale of assets |  |  | 327,059 | 130,691 |  |  | 6,045 |  | 16,183 |  |  |  | 4,921 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable settled by deed-in-lieu of foreclosure |  |  | 84,000 | 185,000 |  |  | 8,750 |  | 14,792 |  |  |  | 9,394 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) |  |  |  |  | 1,435,000 | 1,196,000 | 273,000 |  | 500,000 |  | 491,000 |  | 260,000 |  | 1,946,000 |  |  |  |  |  |  |  | 695,000 | 582,000 |  |  | 846,000 |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73.20% |  |  |  |  |  |  |
Purchase price on acquisition |  |  |  |  | 310,397 | 144,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  | 54,780 |  |  |  |  |  |  |  |  |  |  |  | 127,000 | 185,000 |  |  | 127,000 |
Purchase price funded by cash payment on acquisition |  |  |  |  | 195,900 | 69,025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company |  |  | 109,858 | 0 | 114,497 | 75,375 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received on sale of joint venture interest |  |  |  |  |  |  | 14,795 |  | 30,975 |  |  |  | 14,315 |  | 118,810 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of investments in unconsolidated entity |  |  |  |  |  |  |  | 8,185 |  | 12,347 |  |  |  | 3,365 | 24,590 |  |  |  |  |  |  |  |  |  |  |  |  |
Additional ownership interest acquired (as a percent) |  |  |  |  | 75.00% | 33.30% |  |  |  |  |  |  |  |  |  |  |  |  |  | 67.50% |  |  |  |  |  |  |  |
Loan paid off |  |  |  |  |  |  |  |  |  |  | 45,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash distributed to the partners |  |  |  |  |  |  |  |  |  |  | 9,780 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of property, pro rata share |  |  |  |  |  |  |  |  |  |  |  | 11,502 |  |  |  |  |  |  |  |  |  | 18,263 |  |  | 18,263 | 44,424 |  | 28,129
Gain on sale of property, pro rata share included in net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  | $ (3,565) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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