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Mortgage Notes Payable - Footnotes (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Mar. 03, 2015	Feb. 25, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Feb. 19, 2015	Dec. 31, 2014
Mortgage loans payable on real estate
Carrying amount of mortgage notes			$ 5,552,551		$ 5,552,551			$ 5,115,482
Related parties			284,641		284,641			289,039
(Gain) loss on extinguishment of debt, net					(636)	$ 358
Mortgage notes payable which could become recourse			13,500		13,500			73,165
Interest expense capitalized			3,837	$ 3,098	6,466	$ 5,583
Fair value of mortgage notes payable			5,814,998		5,814,998			5,455,453
Fashion Outlets of Chicago
Mortgage loans payable on real estate
Carrying amount of mortgage notes			$ 200,000		$ 200,000			$ 119,329
Interest rate basis					LIBOR
Interest rate spread over basis (as a percent)	1.50%
Effective interest rate (as a percent)			1.84%		1.84%			2.97%
Related parties			$ 0		$ 0			$ 0
Great Northern Mall
Mortgage loans payable on real estate
Carrying amount of mortgage notes			0		0			34,494
Related parties			0		0			0
(Gain) loss on extinguishment of debt, net					(1,609)
Lakewood Center Mortgage
Mortgage loans payable on real estate
Carrying amount of mortgage notes			$ 410,000		$ 410,000			253,708
Effective interest rate (as a percent)			3.46%		3.46%
Related parties			$ 0		$ 0			0
(Gain) loss on extinguishment of debt, net		$ (2,245)
The Mall at Northgate
Mortgage loans payable on real estate
Carrying amount of mortgage notes			$ 64,000		$ 64,000			$ 64,000
Interest rate basis					LIBOR
Interest rate spread over basis (as a percent)					2.25%
Effective interest rate (as a percent)			3.07%		3.07%			3.05%
Related parties			$ 0		$ 0			$ 0
Superstition Springs Center
Mortgage loans payable on real estate
Carrying amount of mortgage notes			$ 67,921		$ 67,921			$ 68,079
Interest rate basis					LIBOR
Interest rate spread over basis (as a percent)					2.30%
Effective interest rate (as a percent)			2.02%		2.02%			1.98%
Related parties			$ 0		$ 0			$ 0
Vintage Faire Mall
Mortgage loans payable on real estate
Carrying amount of mortgage notes			$ 278,726		$ 278,726			0
Effective interest rate (as a percent)			3.55%		3.55%
Related parties			$ 0		$ 0		$ 280,000	$ 0
Freehold Raceway Mall and Chandler Fashion Center
Mortgage loans payable on real estate
Percentage of loan assumed by third party (as a percent)					49.90%
PPRLP Queens Portfolio | Lakewood Center Mortgage
Mortgage loans payable on real estate
Effective interest rate (as a percent)			3.46%		3.46%

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations such as mortgage loans.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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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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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Fair value portion of notes payable.

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