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Acquisitions: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				0 Months Ended						2 Months Ended	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Feb. 29, 2012 500 North Michigan Avenue: sqft	Oct. 03, 2012 FlatIron Crossing sqft	Oct. 26, 2012 Arrowhead Towne Center sqft	Jan. 03, 2013 Kings Plaza	Nov. 28, 2012 Kings Plaza sqft	Jan. 31, 2013 Green Acres Mall	Jan. 24, 2013 Green Acres Mall sqft	Mar. 31, 2013 Green Acres Mall	Dec. 31, 2012 Green Acres Mall
Acquisition
Additional ownership interest (as a percent)					75.00%	33.30%
Property square footage				327,000	1,439,000	1,196,000		1,199,000		1,800,000
Purchase price on acquisition				$ 70,925	$ 310,397	$ 144,400		$ 756,000		$ 500,000
Ownership interest at completion of acquisition (as a percent)					100.00%	100.00%
Ownership interest before acquisition (as a percent)					25.00%	66.70%
Purchase price funded by cash payment on acquisition					195,900	69,025		726,000
Purchase price funded by issuance of restricted common stock								30,000
Deposit paid												30,000
Purchase price, balance remaining after deposit										470,000
Face amount of debt								500,000		325,000
Placement of mortgage note on the property							146,000	354,000	225,000	100,000
Purchase price paid through assumption of debt by the Company					114,497	75,375
Allocation of the fair value
Property				66,033	443,391	423,349		714,589		477,673
Deferred charges				7,450	25,251	31,500		37,371		45,130
Restricted cash						4,009
Cash and cash equivalents					3,856
Tenant receivables						926
Other assets				2,143	2,101	4,234		29,282		19,125
Total assets acquired				75,626	474,599	464,018		781,242		541,928
Mortgage note payable					175,720	244,403
Accounts payable					366	815
Other accrued liabilities				4,701	11,071	10,449		25,242		41,928
Total liabilities assumed				4,701	187,157	255,667		25,242		41,928
Fair value of acquired net assets				70,925	287,442	208,351		756,000		500,000
Business combination
Fair value of existing ownership interest					91,542	139,326
Carrying value of investment	(945,935)		(974,258)		(33,382)	(23,597)
Prior gain deferral recognized					26,067
Gain on remeasurement					84,227	115,729
Incremental revenue generated from acquired property											12,956
Incremental income of acquired property											894
Pro forma information
Total revenue	267,106	22,787
Income from continuing operations	$ 263,038	$ 47,174

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