ACQUISITIONS (Details) (USD $)	2 Months Ended	3 Months Ended								12 Months Ended											0 Months Ended						0 Months Ended								12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 As Adjusted (Unaudited)	Dec. 31, 2011 As Adjusted (Unaudited)	Dec. 31, 2012 Acquired Lease Intangibles	Dec. 31, 2012 Acquired Above Market Lease Intangibles	Dec. 31, 2012 Acquired Below Market Lease Intangibles	Dec. 31, 2012 Land	Dec. 31, 2012 Building and improvements	Dec. 31, 2012 Other	Feb. 21, 2012 Grand Traverse Mall item	Dec. 31, 2012 Grand Traverse Mall Acquired Lease Intangibles	Dec. 31, 2012 Grand Traverse Mall Acquired Above Market Lease Intangibles	Dec. 31, 2012 Grand Traverse Mall Acquired Below Market Lease Intangibles	Dec. 31, 2012 Grand Traverse Mall Land	Dec. 31, 2012 Grand Traverse Mall Building and improvements	Dec. 28, 2012 The Mall at Turtle Creek item	Dec. 31, 2012 The Mall at Turtle Creek	Dec. 31, 2012 The Mall at Turtle Creek Acquired Lease Intangibles	Dec. 31, 2012 The Mall at Turtle Creek Acquired Above Market Lease Intangibles	Dec. 31, 2012 The Mall at Turtle Creek Acquired Below Market Lease Intangibles	Dec. 31, 2012 The Mall at Turtle Creek Land	Dec. 31, 2012 The Mall at Turtle Creek Building and improvements	Dec. 31, 2012 The Mall at Turtle Creek Other	Dec. 31, 2012 Grand Traverse and The Mall at Turtle Creek
Acquisition
Square Footage Acquired										674,160											306,241						367,919
Purchase Price		$ 158,000,000								$ 158,000,000											$ 62,000,000						$ 96,300,000
Restructured and discounted non-recourse loan assumed																					62,000,000						79,500,000
Term of non-recourse loan																					5 years						3 years 6 months
Discount rate of non-recourse loan (as a percent)																					5.02%						6.54%
Premium or discount recorded as a result of mortgage assumption																											4,800,000	4,800,000
Interest acquired (as a percent)																											100.00%
Acquisition and transaction costs paid										1,000,000
Revenues	35,540,000	62,154,000	58,463,000	56,949,000	56,408,000	60,907,000	58,554,000	56,255,000	59,100,000	233,974,000	234,816,000		243,215,000	250,434,000																					7,400,000
Net loss		(13,586,000)	(13,056,000)	(15,940,000)	(26,077,000)	(4,871,000)	(8,999,000)	(6,572,000)	(6,534,000)																										2,800,000
Additional information regarding the company's acquisitions
Value of assets acquired															13,797,000	6,682,000	(4,870,000)	33,674,000	112,191,000	1,276,000		6,363,000	4,210,000	(430,000)	11,420,000	40,046,000			7,434,000	2,472,000	(4,440,000)	22,254,000	72,145,000	1,276,000
Condensed pro forma financial information
Total revenues	35,540,000	62,154,000	58,463,000	56,949,000	56,408,000	60,907,000	58,554,000	56,255,000	59,100,000	233,974,000	234,816,000		243,215,000	250,434,000																					7,400,000
Net loss	$ (2,866,000)									$ (68,659,000)	$ (26,976,000)	$ (2,866,000)	$ (71,025,000)	$ (32,862,000)
Net loss per share - Basic and Diluted (in dollars per share)	$ (0.08)	$ (0.28)	$ (0.27)	$ (0.32)	$ (0.71)	$ (0.14)	$ (0.25)	$ (0.18)	$ (0.18)	$ (1.49)	$ (0.75)		$ (1.54)	$ (0.92)
Weighted average shares - basic and diluted	35,906,105	49,258,249	49,244,562	49,242,014	36,785,376	35,906,105	35,906,105	35,906,105	35,905,695	46,149,893	35,906,105		46,149,893	35,906,105