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Mortgage Notes Payable - Footnotes (Details) - USD ($)			6 Months Ended
	Jan. 14, 2016	Jan. 06, 2016	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Mortgage loans payable on real estate
Unamortized deferred finance costs			$ 12,368,000		$ 16,025,000
Loss on early extinguishment of debt, net			$ 8,453,000	$ 636,000
Freehold Raceway Mall
Mortgage loans payable on real estate
Percentage of loan assumed by third party (as a percent)			49.90%
Arrowhead Towne Center
Mortgage loans payable on real estate
Percentage of loan assumed by third party (as a percent)		40.00%
Ownership interest sold (percent)		40.00%	40.00%
MAC Heitman Portfolio
Mortgage loans payable on real estate
Ownership interest sold (percent)	49.00%		49.00%
Arrowhead Towne Center
Mortgage loans payable on real estate
Face amount of debt		$ 400,000,000
Effective interest rate (percent)		4.05%	0.00%
Loss on early extinguishment of debt, net		$ (3,575,000)
Percentage of loan assumed by third party (as a percent)		40.00%
Northgate Mall
Mortgage loans payable on real estate
Effective interest rate (percent)			3.35%		3.30%
Interest rate spread over basis (percent)			2.25%
Superstition Springs Center
Mortgage loans payable on real estate
Effective interest rate (percent)			2.27%		2.17%
Interest rate spread over basis (percent)			2.30%

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting that was sold by the entity during the period.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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