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Acquisitions: Narrative (Details) ft² in Thousands, $ in Thousands									12 Months Ended
	Feb. 17, 2015 USD ($) ft²	Nov. 14, 2014 USD ($)	Oct. 31, 2014 USD ($)	Jun. 04, 2014 USD ($) ft²	Oct. 24, 2013 USD ($)	Apr. 25, 2013 USD ($) a	Jan. 31, 2013 USD ($)	Jan. 24, 2013 USD ($) ft²	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) ft²	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Sep. 17, 2013 ft²
Acquisition
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities									$ 0	$ 1,414,659	$ 257,064
Deposits paid									12,500	$ 0	$ 0
Camelback Colonnade
Acquisition
Property square footage | ft²													619
Ownership Percentage													73.20%
Additional ownership interest (as a percent)													67.50%
Ownership percentage at completion of acquisition (as a percent)													100.00%
Green Acres Mall
Acquisition
Property square footage | ft²								1,799
Purchase price								$ 500,000
Face amount of debt								325,000
Placement of mortgage note on the property							$ 225,000	100,000
Deposits paid												$ 30,000
Purchase price, balance remaining after deposit								$ 470,000
Green Acres Adjacent
Acquisition
Property square footage | a						19
Purchase price						$ 22,577
Superstition Springs Land I
Acquisition
Purchase price					$ 46,162
Purchase price funded by cash payment on acquisition					23,662
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities					$ 22,500
Additional ownership interest (as a percent)					33.30%
Ownership percentage at completion of acquisition (as a percent)					100.00%
Cascade Mall
Acquisition
Property square footage | ft²				589
Purchase price				$ 15,233
Additional ownership interest (as a percent)				49.00%
Ownership percentage at completion of acquisition (as a percent)				100.00%
PPR Queens Portfolio
Acquisition
Purchase price		$ 1,838,886
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities		672,109
Issuance restricted common stock		$ 1,166,777
Additional ownership interest (as a percent)		49.00%
Ownership percentage at completion of acquisition (as a percent)		100.00%
Inland Center
Acquisition
Property square footage | ft²	866
Purchase price	$ 51,250
Purchase price funded by cash payment on acquisition	26,250
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities	$ 25,000
Incremental revenue generated from acquired property									12,829
Incremental earnings (loss) of acquired property									1,892
Additional ownership interest (as a percent)	50.00%
Ownership percentage at completion of acquisition (as a percent)	100.00%
Affiliated Entity | Fashion Outlets of Chicago
Acquisition
Property square footage | ft²										537
Purchase price			$ 69,987
Fair value of contingent consideration									10,953
Noncontrolling interest adjustment									$ 76,141
Purchase price funded by cash payment on acquisition			55,867
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities			$ 14,120

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