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Subsequent Events (Details) $ / shares in Units, ft² in Thousands						12 Months Ended
	Feb. 09, 2017 $ / shares	Feb. 02, 2017 USD ($)	Jan. 18, 2017 USD ($) ft²	Nov. 12, 2015 USD ($) $ / shares	Oct. 30, 2015 $ / shares	Dec. 31, 2016 $ / shares	Dec. 31, 2015 $ / shares	Feb. 13, 2017 USD ($)	Feb. 01, 2017 USD ($)	May 09, 2016 USD ($)	Feb. 17, 2016 USD ($)	Sep. 30, 2015 USD ($)
Subsequent events
Dividends declared for common stock (in dollars per share) | $ / shares				$ 2.00	$ 2.00	$ 2.75	$ 6.63
Authorized amount for stock repurchase program				$ 400,000,000						$ 400,000,000	$ 400,000,000	$ 1,200,000,000
Subsequent event
Subsequent events
Dividends declared for common stock (in dollars per share) | $ / shares	$ 0.71
Authorized amount for stock repurchase program								$ 500,000,000
Subsequent event | West Acres | Loans payable
Subsequent events
Face amount of debt									$ 80,000,000
Effective interest rate (as a percent)									4.61%
Subsequent event | Kierland Commons | Loans payable
Subsequent events
Face amount of debt		$ 225,000,000
Interest rate on debt (as a percent)		3.95%
Debt term (years)		10 years
Subsequent event | Cascade Mall
Subsequent events
Property square footage | ft²			589
Subsequent event | Northgate Mall
Subsequent events
Property square footage | ft²			750
Subsequent event | Cascade and Northgate Malls
Subsequent events
Proceeds from sale			$ 170,000,000

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