Schedule III Real Estate and Accumulated Depreciation (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	1,283,491,000
Initial Cost
Land	332,465,000
Buildings and Improvements	1,252,834,000
Costs Capitalized Subsequent to Acquisition
Land	7,523,000
Buildings and Improvements	59,933,000
Gross Amounts at Which Carried at Close of Period
Land	339,988,000
Buildings and Improvements	1,312,767,000
Total	1,652,755,000
Accumulated Depreciation	116,336,000
Aggregate cost of land, buildings and improvements for federal income tax payments	1,600,000,000
Building and improvements
Gross Amounts at Which Carried at Close of Period
Estimated lives	40 years
Equipment and fixtures | Minimum
Gross Amounts at Which Carried at Close of Period
Estimated lives	5 years
Equipment and fixtures | Maximum
Gross Amounts at Which Carried at Close of Period
Estimated lives	10 years
Animas Valley Mall
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	51,731,000
Initial Cost
Land	6,509,000
Buildings and Improvements	32,270,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	875,000
Gross Amounts at Which Carried at Close of Period
Land	6,509,000
Buildings and Improvements	33,145,000
Total	39,654,000
Accumulated Depreciation	4,042,000
Bayshore Mall
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	29,530,000
Initial Cost
Land	4,770,000
Buildings and Improvements	33,305,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	131,000
Gross Amounts at Which Carried at Close of Period
Land	4,770,000
Buildings and Improvements	33,436,000
Total	38,206,000
Accumulated Depreciation	3,192,000
Birchwood Mall
Initial Cost
Land	8,316,000
Buildings and Improvements	44,884,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	(346,000)
Gross Amounts at Which Carried at Close of Period
Land	8,316,000
Buildings and Improvements	44,538,000
Total	52,854,000
Accumulated Depreciation	3,884,000
Cache Valley Mall
Initial Cost
Land	2,890,000
Buildings and Improvements	19,402,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	660,000
Gross Amounts at Which Carried at Close of Period
Land	2,890,000
Buildings and Improvements	20,062,000
Total	22,952,000
Accumulated Depreciation	1,661,000
Cache Valley Marktplace
Initial Cost
Land	1,072,000
Buildings and Improvements	7,440,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	13,000
Gross Amounts at Which Carried at Close of Period
Land	1,072,000
Buildings and Improvements	7,453,000
Total	8,525,000
Accumulated Depreciation	960,000
Chula Vista Center
Initial Cost
Land	13,214,000
Buildings and Improvements	71,598,000
Costs Capitalized Subsequent to Acquisition
Land	1,150,000
Buildings and Improvements	9,754,000
Gross Amounts at Which Carried at Close of Period
Land	14,364,000
Buildings and Improvements	81,352,000
Total	95,716,000
Accumulated Depreciation	6,028,000
Collin Creek
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	62,204,000
Initial Cost
Land	14,746,000
Buildings and Improvements	48,103,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	308,000
Gross Amounts at Which Carried at Close of Period
Land	14,746,000
Buildings and Improvements	48,411,000
Total	63,157,000
Accumulated Depreciation	4,228,000
Colony Square Mall
Initial Cost
Land	4,253,000
Buildings and Improvements	29,578,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	50,000
Gross Amounts at Which Carried at Close of Period
Land	4,253,000
Buildings and Improvements	29,628,000
Total	33,881,000
Accumulated Depreciation	3,001,000
Gateway Mall
Initial Cost
Land	7,097,000
Buildings and Improvements	36,573,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	2,615,000
Gross Amounts at Which Carried at Close of Period
Land	7,097,000
Buildings and Improvements	39,188,000
Total	46,285,000
Accumulated Depreciation	4,328,000
Grand Traverse Mall
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	61,333,000
Initial Cost
Land	11,420,000
Buildings and Improvements	46,409,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	(764,000)
Gross Amounts at Which Carried at Close of Period
Land	11,420,000
Buildings and Improvements	45,645,000
Total	57,065,000
Accumulated Depreciation	2,579,000
Knollwood Mall
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	34,594,000
Initial Cost
Land	6,127,000
Buildings and Improvements	32,905,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	(31,000)
Gross Amounts at Which Carried at Close of Period
Land	6,127,000
Buildings and Improvements	32,874,000
Total	39,001,000
Accumulated Depreciation	3,148,000
Lakeland Square Mall
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	50,387,000
Initial Cost
Land	10,938,000
Buildings and Improvements	56,867,000
Costs Capitalized Subsequent to Acquisition
Land	375,000
Buildings and Improvements	873,000
Gross Amounts at Which Carried at Close of Period
Land	11,313,000
Buildings and Improvements	57,740,000
Total	69,053,000
Accumulated Depreciation	5,093,000
Lansing Mall
Initial Cost
Land	9,615,000
Buildings and Improvements	49,220,000
Costs Capitalized Subsequent to Acquisition
Land	350,000
Buildings and Improvements	271,000
Gross Amounts at Which Carried at Close of Period
Land	9,965,000
Buildings and Improvements	49,491,000
Total	59,456,000
Accumulated Depreciation	4,672,000
The Mall At Sierra Vista
Initial Cost
Land	7,078,000
Buildings and Improvements	36,441,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	(71,000)
Gross Amounts at Which Carried at Close of Period
Land	7,078,000
Buildings and Improvements	36,370,000
Total	43,448,000
Accumulated Depreciation	3,009,000
Mall St Vincent
Initial Cost
Land	4,604,000
Buildings and Improvements	21,927,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	(325,000)
Gross Amounts at Which Carried at Close of Period
Land	4,604,000
Buildings and Improvements	21,602,000
Total	26,206,000
Accumulated Depreciation	2,300,000
New Park Mall LP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	64,913,000
Initial Cost
Land	17,848,000
Buildings and Improvements	58,384,000
Costs Capitalized Subsequent to Acquisition
Land	2,867,000
Buildings and Improvements	2,472,000
Gross Amounts at Which Carried at Close of Period
Land	20,715,000
Buildings and Improvements	60,856,000
Total	81,571,000
Accumulated Depreciation	5,697,000
North Plains Mall
Initial Cost
Land	2,218,000
Buildings and Improvements	11,768,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	919,000
Gross Amounts at Which Carried at Close of Period
Land	2,218,000
Buildings and Improvements	12,687,000
Total	14,905,000
Accumulated Depreciation	1,127,000
Pierre Bossier Mall
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	51,846,000
Initial Cost
Land	7,522,000
Buildings and Improvements	38,247,000
Costs Capitalized Subsequent to Acquisition
Land	817,000
Buildings and Improvements	11,470,000
Gross Amounts at Which Carried at Close of Period
Land	8,339,000
Buildings and Improvements	49,717,000
Total	58,056,000
Accumulated Depreciation	3,415,000
Sikes Senter
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	47,822,000
Initial Cost
Land	5,915,000
Buildings and Improvements	34,075,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	2,494,000
Gross Amounts at Which Carried at Close of Period
Land	5,915,000
Buildings and Improvements	36,569,000
Total	42,484,000
Accumulated Depreciation	4,721,000
Silver Lake Mall
Initial Cost
Land	3,237,000
Buildings and Improvements	12,914,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	205,000
Gross Amounts at Which Carried at Close of Period
Land	3,237,000
Buildings and Improvements	13,119,000
Total	16,356,000
Accumulated Depreciation	1,254,000
Southland Mall
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	72,067,000
Initial Cost
Land	23,407,000
Buildings and Improvements	81,474,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	6,729,000
Gross Amounts at Which Carried at Close of Period
Land	23,407,000
Buildings and Improvements	88,203,000
Total	111,610,000
Accumulated Depreciation	8,994,000
Southland Center
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	78,314,000
Initial Cost
Land	13,697,000
Buildings and Improvements	51,860,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	(378,000)
Gross Amounts at Which Carried at Close of Period
Land	13,697,000
Buildings and Improvements	51,482,000
Total	65,179,000
Accumulated Depreciation	3,746,000
Spring Hill Mall
Initial Cost
Land	8,219,000
Buildings and Improvements	23,679,000
Costs Capitalized Subsequent to Acquisition
Land	1,206,000
Buildings and Improvements	1,220,000
Gross Amounts at Which Carried at Close of Period
Land	9,425,000
Buildings and Improvements	24,899,000
Total	34,324,000
Accumulated Depreciation	2,427,000
Steeplegate Mall
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	43,861,000
Initial Cost
Land	11,438,000
Buildings and Improvements	42,032,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	608,000
Gross Amounts at Which Carried at Close of Period
Land	11,438,000
Buildings and Improvements	42,640,000
Total	54,078,000
Accumulated Depreciation	4,138,000
The Boulevard Mall
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	81,353,000
Initial Cost
Land	34,523,000
Buildings and Improvements	46,428,000
Costs Capitalized Subsequent to Acquisition
Land	758,000
Buildings and Improvements	3,829,000
Gross Amounts at Which Carried at Close of Period
Land	35,281,000
Buildings and Improvements	50,257,000
Total	85,538,000
Accumulated Depreciation	5,278,000
Three Rivers Mall
Initial Cost
Land	2,080,000
Buildings and Improvements	11,142,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	976,000
Gross Amounts at Which Carried at Close of Period
Land	2,080,000
Buildings and Improvements	12,118,000
Total	14,198,000
Accumulated Depreciation	1,661,000
Valley Hills Mall
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	51,107,000
Initial Cost
Land	10,047,000
Buildings and Improvements	61,817,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	625,000
Gross Amounts at Which Carried at Close of Period
Land	10,047,000
Buildings and Improvements	62,442,000
Total	72,489,000
Accumulated Depreciation	6,112,000
Vista Ridge Mall
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	72,460,000
Initial Cost
Land	15,965,000
Buildings and Improvements	46,560,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	420,000
Gross Amounts at Which Carried at Close of Period
Land	15,965,000
Buildings and Improvements	46,980,000
Total	62,945,000
Accumulated Depreciation	5,185,000
Washington Park Mall
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	10,400,000
Initial Cost
Land	1,388,000
Buildings and Improvements	8,213,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	435,000
Gross Amounts at Which Carried at Close of Period
Land	1,388,000
Buildings and Improvements	8,648,000
Total	10,036,000
Accumulated Depreciation	1,101,000
West Valley Mall
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	47,260,000
Initial Cost
Land	31,340,000
Buildings and Improvements	38,316,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	3,515,000
Gross Amounts at Which Carried at Close of Period
Land	31,340,000
Buildings and Improvements	41,831,000
Total	73,171,000
Accumulated Depreciation	4,799,000
Westwood Mall
Initial Cost
Land	5,708,000
Buildings and Improvements	28,006,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	11,000
Gross Amounts at Which Carried at Close of Period
Land	5,708,000
Buildings and Improvements	28,017,000
Total	33,725,000
Accumulated Depreciation	2,268,000
White Mountain Mall
Initial Cost
Land	3,010,000
Buildings and Improvements	11,418,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	1,490,000
Gross Amounts at Which Carried at Close of Period
Land	3,010,000
Buildings and Improvements	12,908,000
Total	15,918,000
Accumulated Depreciation	2,074,000
Turtle Creek
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	84,363,000
Initial Cost
Land	22,254,000
Buildings and Improvements	79,579,000
Gross Amounts at Which Carried at Close of Period
Land	22,254,000
Buildings and Improvements	79,579,000
Total	101,833,000
Total Properties
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	995,545,000
Initial Cost
Land	332,465,000
Buildings and Improvements	1,252,834,000
Costs Capitalized Subsequent to Acquisition
Land	7,523,000
Buildings and Improvements	51,053,000
Gross Amounts at Which Carried at Close of Period
Land	339,988,000
Buildings and Improvements	1,303,887,000
Total	1,643,875,000
Accumulated Depreciation	116,122,000
Other
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	287,946,000
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	8,880,000
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	8,880,000
Total	8,880,000
Accumulated Depreciation	214,000