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Subsequent Events: (Details) $ / shares in Units, ft² in Thousands								2 Months Ended	12 Months Ended
	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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