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v3.3.1.900

Subsequent Events: (Details) $ / shares in Units, ft² in Thousands |  |  |  |  |  |  |  | 2 Months Ended | 12 Months Ended |  |
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Feb. 22, 2016 USD ($) shares | Jan. 29, 2016 $ / shares | Jan. 20, 2016 $ / shares shares | Jan. 14, 2016 USD ($) ft² | Jan. 04, 2016 USD ($) ft² | Nov. 13, 2015 USD ($) shares | Oct. 30, 2015 $ / shares | Jan. 20, 2016 shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Jan. 06, 2016 | Sep. 30, 2015 USD ($)
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company |  |  |  |  |  |  |  |  | $ 0 | $ 1,414,659,000 | $ 257,064,000 |  |
Accelerated share repurchased, number of shares purchased (shares) | shares |  |  |  |  |  | 4,140,788 |  |  |  |  |  |  |
Dividends declared for common stock | $ / shares |  |  |  |  |  |  | $ 2.00 |  | $ 6.63 |  |  |  |
Authorized amount for stock repurchase program |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  | $ 1,200,000,000
Authorized amount for accelerated stock repurchase program |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchased, number of shares purchased (shares) | shares | 4,222,193 |  | 970,609 |  |  |  |  | 5,111,397 |  |  |  |  |
Average price per share paid for stock repurchased for accelerated stock repurchases (in dollars per share) | $ / shares |  |  | $ 78.26 |  |  |  |  |  |  |  |  |  |
Dividends declared for common stock | $ / shares |  | $ 0.68 |  |  |  |  |  |  |  |  |  |  |
Authorized amount for stock repurchase program | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount for accelerated stock repurchase program | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Arrowhead Towne Center | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 4.05% |
Country Club Plaza [Member] | Country Club Plaza [Member] | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  | 1,300 |  |  |  |  |  |  |  |
Purchase price on acquisition |  |  |  |  | $ 660,000,000 |  |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company |  |  |  |  | $ 330,000,000 |  |  |  |  |  |  |  |
Twenty Ninth Street | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  | 850 |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 4.10% |  |  |  |  |  |  |  |  |
Deptford Mall | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  | 1,040 |  |  |  |  |  |  |  |  |
FlatIron Crossing | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  | 1,430 |  |  |  |  |  |  |  |  |
Depford Mall, FlatIron Crossing, Twenty Ninth Street [Member] | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  | $ 750,980,000 |  |  |  |  |  |  |  |  |
Cash payment |  |  |  | 458,110,000 |  |  |  |  |  |  |  |  |
Assumption of debt |  |  |  | $ 292,870,000 |  |  |  |  |  |  |  |  |
Percentage of ownership interest sold |  |  |  | 49.00% |  |  |  |  |  |  |  |  |

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