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Investments in Unconsolidated Joint Ventures: (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended |  | 1 Months Ended | 0 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Oct. 03, 2012 FlatIron Crossing sqft | Oct. 26, 2012 Arrowhead Towne Center sqft | Mar. 31, 2012 Chandler Village Center, LLC | Mar. 31, 2012 Chandler Village Center, LLC | Mar. 30, 2012 Chandler Village Center, LLC sqft | Mar. 31, 2012 Chandler Festival | Mar. 31, 2012 Chandler Festival | Mar. 30, 2012 Chandler Festival sqft | Mar. 31, 2012 SanTan Village Power Center | Mar. 30, 2012 SanTan Village Power Center sqft | May 31, 2012 Chandler Gateway sqft | Aug. 10, 2012 NorthPark Center sqft
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest sold |  |  |  |  | 50.00% |  |  | 50.00% |  |  |  |  | 50.00% |
Additional ownership interest acquired (as a percent) |  |  | 75.00% | 33.30% |  |  |  |  |  |  |  |  |  |
Property square footage |  |  | 1,439,000 | 1,196,000 |  |  | 273,000 |  |  | 500,000 |  | 491,000 | 260,000 | 1,946,000
Purchase price on acquisition |  |  | $ 310,397 | $ 144,400 |  |  |  |  |  |  |  |  |  |
Purchase price funded by cash payment on acquisition |  |  | 195,900 | 69,025 |  |  |  |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company |  |  | 114,497 | 75,375 |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  | 54,780 |  |  |
Gain (loss) on sale or remeasurement of assets | (190) | 22,990 |  |  |  |  |  |  |  |  | 23,294 |  |  |
Loan paid off |  |  |  |  |  |  |  |  |  |  | 45,000 |  |  |
Consideration received on sale of joint venture interest |  |  |  |  | 14,795 |  |  | 30,975 |  |  |  |  | 14,315 | 118,810
Gain on sale of investments in unconsolidated entity |  |  |  |  |  | 8,184 |  |  | 12,347 |  |  |  | 3,363 | 24,590
Cash proceeds for sale of interest in property | 6,059 | 23,180 |  |  | 6,045 |  |  | 16,183 |  |  |  |  | 4,921 |
Mortgage note assumed by purchaser as sale consideration |  |  |  |  | 8,750 |  |  | 14,792 |  |  |  |  | 9,394 |
Cash distributed to the partners |  |  |  |  |  |  |  |  |  |  | 9,780 |  |  |
Gain on sale of property, pro rata share |  |  |  |  |  |  |  |  |  |  | 11,502 |  |  |
Gain on sale of property, pro rata share included in net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | $ 3,565 |  |  |

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