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Subsequent Events: (Details) (USD $) In Thousands, except Per Share data, 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 | 1 Months Ended | 0 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Line of Credit | Aug. 06, 2013 Line of Credit | Aug. 06, 2013 Line of Credit Low end of range | Sep. 30, 2013 Line of Credit Low end of range | Aug. 06, 2013 Line of Credit High end of range | Sep. 30, 2013 Line of Credit High end of range | Dec. 08, 2011 Unsecured term loan | Sep. 30, 2013 Unsecured term loan | Dec. 08, 2011 Unsecured term loan Low end of range | Dec. 08, 2011 Unsecured term loan High end of range | Sep. 30, 2013 Mervyn's | May 31, 2012 Mervyn's | Oct. 25, 2013 Subsequent event Dividend declared | Oct. 23, 2013 Subsequent event Mervyn's | Oct. 15, 2013 Subsequent event Mervyn's | Oct. 21, 2013 Subsequent event FlatIron Crossing | Oct. 08, 2013 Subsequent event Ridgmar Mall sqft | Oct. 24, 2013 Superstition Springs Land I Subsequent event sqft
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,273,000 | 999,000
Purchase price on acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 44,242
Purchase price funded by cash payment on acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,742
Noncash or Part Noncash Acquisition, Debt Assumed |  |  | 109,858 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,500
Proceeds from sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000 | 20,750 |  | 5,430 | 5,700 |  | 60,900 |
Mortgage Loans on Real Estate, New Mortgage Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 268,000 |  |
Gain (loss) from sale | (1,281) | (256) | 140,631 | 75,571 |  |  |  |  |  |  |  |  |  |  | (2,617) | (407) |  |  |  |  |  |
Additional ownership interest acquired (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.30%
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities |  |  | 2,694,945 | 1,813,271 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,657 |
Distributions to Co-venture Partner |  |  | 14,496 | 34,615 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,243 |
Interest rate on debt (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.85% |  |
Debt Instrument, Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |
Interest rate spread over basis (as a percent) |  |  | 1.50% |  |  |  | 1.375% | 1.75% | 2.00% | 3.00% |  | 2.20% | 1.95% | 3.20% |  |  |  |  |  |  |  |
Expansion borrowing capacity |  |  |  |  | $ 2,000,000 | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate basis (as a percent) |  |  |  |  |  |  |  |  |  |  | LIBOR | LIBOR |  |  |  |  |  |  |  |  |  |
Dividend/distribution for common stockholders and OP Unit holders (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.62 |  |  |  |  |
Percentage of dividend/distribution payable in cash (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |

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