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Mortgage Notes Payable - Premiums and Discounts (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Mortgage loans payable on real estate
Debt premiums (discounts), net	$ 42,295	$ 56,921
Arrowhead Towne Center
Mortgage loans payable on real estate
Debt premiums	10,031	11,568
Deptford Mall One
Mortgage loans payable on real estate
Debt discounts	(6)	(8)
Fashion Outlets of Niagara Falls USA
Mortgage loans payable on real estate
Debt premiums	4,950	5,414
Lakewood Center Mortgage
Mortgage loans payable on real estate
Debt premiums	0	3,708
Los Cerritos Center Mortgage
Mortgage loans payable on real estate
Debt premiums	15,424	17,965
Stonewood Center Mortgage
Mortgage loans payable on real estate
Debt premiums	6,586	7,980
Superstition Springs Center
Mortgage loans payable on real estate
Debt premiums	421	579
Valley Mall
Mortgage loans payable on real estate
Debt discounts	(88)	(132)
Washington Square Mortgage
Mortgage loans payable on real estate
Debt premiums	$ 4,977	$ 9,847

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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