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Discontinued Operations (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Gallery At Market Street [Member]
Jun. 30, 2012
Gallery At Market Street [Member]
Jun. 30, 2013
Gallery At Market Street [Member]
Jun. 30, 2012
Gallery At Market Street [Member]
Apr. 15, 2013
Plant [Member]
Jun. 30, 2013
Plant [Member]
Jun. 30, 2012
Plant [Member]
Jun. 30, 2013
Plant [Member]
Jun. 30, 2012
Plant [Member]
Jan. 24, 2013
Green Acres Mall [Member]
Jun. 30, 2013
Green Acres Mall [Member]
Jun. 30, 2012
Green Acres Mall [Member]
Jun. 30, 2013
Green Acres Mall [Member]
Jun. 30, 2012
Green Acres Mall [Member]
Jan. 06, 2012
350 West Mart Center [Member]
Jun. 30, 2013
350 West Mart Center [Member]
Jun. 30, 2012
350 West Mart Center [Member]
Jun. 30, 2013
350 West Mart Center [Member]
Jun. 30, 2012
350 West Mart Center [Member]
Jun. 30, 2013
Other Real Estate [Member]
Jun. 30, 2012
Other Real Estate [Member]
Jun. 30, 2013
Other Real Estate [Member]
Jun. 30, 2012
Other Real Estate [Member]
Jun. 30, 2013
Retail Properties Segment [Member]
Jun. 30, 2012
Retail Properties Segment [Member]
Jun. 30, 2013
Retail Properties Segment [Member]
Jun. 30, 2012
Retail Properties Segment [Member]
Dec. 31, 2012
Retail Properties Segment [Member]
Jun. 30, 2013
Other Segment [Member]
Jun. 30, 2012
Other Segment [Member]
Jun. 30, 2013
Other Segment [Member]
Jun. 30, 2012
Other Segment [Member]
Dec. 31, 2012
Other Segment [Member]
Disposal Group Including Discontinued Operation Unclassified Balance Sheet Disclosures Abstract                                                                            
Assets related to discontinued operations $ 63,573   $ 63,573   $ 602,000                                               $ 56,348   $ 56,348   $ 568,501 $ 7,225   $ 7,225   $ 33,499
Liabilities related to discontinued operations 2,677   2,677   423,163                                               2,677   2,677   423,163 0   0   0
Discontinued Operation, Income (Loss) from Discontinued Operations Disclosure [Abstract]                                                                            
Total revenues 4,668 45,286 29,391 106,134                                                                    
Total expenses 3,850 30,802 22,256 76,096                                                                    
Income from discontinued operations before gain on sale of real estate 818 14,484 7,135 30,038                                                                    
Gain Loss On Disposal Of Discontinued Operations           33,058 0 33,058 0 32,169 32,169 0 32,169 0 202,275 0 0 202,275 0 54,911 0 0 0 54,911 438 16,896 492 17,802                    
Impairment loss (2,493) (13,511) (4,007) (13,511)                                                                    
Income from discontinued operations $ 63,990 $ 17,869 $ 271,122 $ 89,240                                                 $ 64,136 $ 16,254 $ 270,849 $ 26,473   $ (146) $ (1,309) $ 273 $ 58,865