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Stockholders' Equity: (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended |
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Apr. 23, 2010 | Apr. 20, 2010 | Mar. 22, 2010 | Mar. 12, 2010 | Apr. 30, 2010 | Dec. 31, 2012 | Dec. 31, 2010 | Oct. 24, 2012 Freehold Raceway Mall and Chandler Fashion Center | Apr. 10, 2012 Freehold Raceway Mall and Chandler Fashion Center | Sep. 30, 2009 Freehold Raceway Mall and Chandler Fashion Center | Dec. 31, 2011 Freehold Raceway Mall and Chandler Fashion Center | May 31, 2010 FlatIron Crossing | Sep. 30, 2009 FlatIron Crossing | Sep. 03, 2009 FlatIron Crossing warrant
Stock Dividend: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued in connection with quarterly dividend |  |  | 1,449,542 |  |  |  |  |  |  |  |  |  |  |
Dividend declared (in dollars per share) |  |  | $ 0.60 |  |  |  |  |  |  |  |  |  |  |
Percentage of cash component in aggregate dividend declared |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |
Cash component of dividend declared (in dollars per share) |  |  | $ 0.06 |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of cash election to prorate cash portion of dividend payment |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |
Minimum cash dividend paid in case of cash election (in dollars per share) |  |  | $ 0.06 |  |  |  |  |  |  |  |  |  |  |
Percentage of cash portion of dividend in case of non election |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |
Percentage of share portion of dividend in case of non election |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock trading price used to calculate shares issued as dividends (in dollars per share) |  |  |  | $ 38.53 |  |  |  |  |  |  |  |  |  |
Stock Warrants: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued in connection with the sale of ownership interest |  |  |  |  |  |  |  |  |  |  |  |  |  | 3
Number of shares of warrants exercised |  |  |  |  |  |  |  | 311,786 | 311,786 |  | 311,786 |  |  |
Sale of ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00%
Aggregate number of common shares available for purchase under warrants |  |  |  |  |  |  |  |  |  | 935,358 |  |  |  | 1,250,000
Value of stock warrants |  |  |  |  |  |  |  |  |  | $ 6,496 |  |  | $ 8,068 |
Duration of warrants issued |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |
Exercise of stock warrants |  |  |  |  |  |  |  | 3,922 | 3,448 |  | 1,278 | 17,589 |  |
Exercise price of stock warrants (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 46.68 |  |  |  |
Stock Offerings: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of newly issued shares |  | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Additional stock offering (in shares) | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Total stock offering (in shares) |  |  |  |  | 31,000,000 |  |  |  |  |  |  |  |  |
Initial purchase price of common stock per share (in dollars per share) |  |  |  |  | $ 41.00 |  |  |  |  |  |  |  |  |
Net proceeds of stock offering |  |  |  |  | $ 1,220,829 | $ 175,649 | $ 1,220,829 |  |  |  |  |  |  |

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