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Business Segments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Summary information for the reportable segments        
Rental and other property revenues $ 251,853 [1] $ 244,374 [1] $ 499,700 [1] $ 488,279 [1]
Tax credit and asset management revenues 7,809 8,914 15,061 16,985
Total revenues 259,662 253,288 514,761 505,264
Property operating expenses 101,717 [1] 99,807 [1] 203,420 [1] 198,418 [1]
Investment management expenses 1,697 3,240 3,130 [1] 6,628
Depreciation and amortization 78,345 [1] 87,229 [1] 158,618 173,795 [1]
Provision for real estate impairment losses 0 2,275 0 8,349 [1]
General and administrative expenses 11,153 13,556 22,932 25,181
Other expenses, net 2,226 (957) 4,436 4,772
Total operating expenses 195,138 205,150 392,536 417,143
Net operating income (loss) 64,524 48,138 122,225 88,121
Other items included in continuing operations (60,336) (55,619) (117,394) (118,219)
Income (loss) from continuing operations 4,188 (7,481) 4,831 (30,098)
Conventional Real Estate Operations [Member]
       
Summary information for the reportable segments        
Rental and other property revenues 213,331 [1] 200,795 [1] 422,830 [1] 398,360 [1]
Tax credit and asset management revenues            
Total revenues 213,331 200,795 422,830 398,360
Property operating expenses 77,606 [1] 72,947 [1] 154,933 [1] 145,564 [1]
Investment management expenses          [1]   
Depreciation and amortization    [1]    [1]       [1]
Provision for real estate impairment losses      [1]      [1]
General and administrative expenses            
Other expenses, net          0
Total operating expenses 77,606 72,947 154,933 145,564
Net operating income (loss) 135,725 127,848 267,897 252,796
Other items included in continuing operations          0
Income (loss) from continuing operations 135,725 127,848 267,897 252,796
Affordable Real Estate Operations [Member]
       
Summary information for the reportable segments        
Rental and other property revenues 25,494 [1] 25,162 [1] 50,876 [1] 50,092 [1]
Tax credit and asset management revenues            
Total revenues 25,494 25,162 50,876 50,092
Property operating expenses 10,123 [1] 9,808 [1] 20,682 [1] 19,751 [1]
Investment management expenses          [1]   
Depreciation and amortization    [1]    [1]       [1]
Provision for real estate impairment losses      [1]      [1]
General and administrative expenses            
Other expenses, net          0
Total operating expenses 10,123 9,808 20,682 19,751
Net operating income (loss) 15,371 15,354 30,194 30,341
Other items included in continuing operations          0
Income (loss) from continuing operations 15,371 15,354 30,194 30,341
Proportionate Adjustments [Member]
       
Summary information for the reportable segments        
Rental and other property revenues 13,008 [1],[2] 18,301 [1],[2] 25,951 [1],[2] 39,576 [1],[2]
Tax credit and asset management revenues    [2]    [2]    [2]    [2]
Total revenues 13,008 [2] 18,301 [2] 25,951 [2] 39,576 [2]
Property operating expenses 4,806 [1],[2] 8,355 [1],[2] 9,706 [1],[2] 15,386 [1],[2]
Investment management expenses    [2]    [2]    [1],[2]    [2]
Depreciation and amortization    [1],[2]    [1],[2]    [2]    [1],[2]
Provision for real estate impairment losses      [1],[2]      [1],[2]
General and administrative expenses    [2]    [2]    [2]    [2]
Other expenses, net    [2]    [2]    [2] 0 [2]
Total operating expenses 4,806 [2] 8,355 [2] 9,706 [2] 15,386 [2]
Net operating income (loss) 8,202 [2] 9,946 [2] 16,245 [2] 24,190 [2]
Other items included in continuing operations    [2]    [2]    [2] 0 [2]
Income (loss) from continuing operations 8,202 [2] 9,946 [2] 16,245 [2] 24,190 [2]
Corporate and Amounts Not Allocated to Segments [Member]
       
Summary information for the reportable segments        
Rental and other property revenues 20 [1] 116 [1] 43 [1] 251 [1]
Tax credit and asset management revenues 7,809 8,914 15,061 16,985
Total revenues 7,829 9,030 15,104 17,236
Property operating expenses 9,182 [1] 8,697 [1] 18,099 [1] 17,717 [1]
Investment management expenses 1,697 3,240 3,130 [1] 6,628
Depreciation and amortization 78,345 [1] 87,229 [1] 158,618 173,795 [1]
Provision for real estate impairment losses   2,275 [1]   8,349 [1]
General and administrative expenses 11,153 13,556 22,932 25,181
Other expenses, net 2,226 (957) 4,436 4,772
Total operating expenses 102,603 114,040 207,215 236,442
Net operating income (loss) (94,774) (105,010) (192,111) (219,206)
Other items included in continuing operations (60,336) (55,619) (117,394) (118,219)
Income (loss) from continuing operations $ (155,110) $ (160,629) $ (309,505) $ (337,425)
[1] Proportionate property net operating income, our key measurement of segment profit or loss excludes property management revenues (which are included in rental and other property revenues), property management expenses and casualty gains and losses (which are included in property operating expenses) and depreciation and amortization and provision for real estate impairment losses. Accordingly, we do not allocate these amounts to our segments.
[2] Represents adjustments for the noncontrolling interests in consolidated real estate partnerships’ share of the results of our consolidated properties and the results of consolidated properties that we do not manage, which are excluded from our measurement of segment performance but included in the related consolidated amounts, and our share of the results of operations of our unconsolidated real estate partnerships that we manage, which are included in our measurement of segment performance but excluded from the related consolidated amounts.