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Business Segments - (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Summary information for the reportable segments                      
Rental and other property revenues (3)                 $ 956,954 $ 952,831 $ 939,231
Tax credit and asset management revenues                 24,356 31,532 34,822
Total revenues $ 245,875 $ 246,387 $ 244,783 $ 244,265 $ 242,178 $ 246,843 $ 246,418 $ 248,924 981,310 984,363 974,053
Property operating expenses (3)                 359,393 373,654 375,710
Investment management expenses                 5,855 7,310 4,341
Depreciation and amortization (3)                 306,301 282,608 291,910
Provision for real estate impairment losses (3)                 0 1,820 0
General and administrative expenses                 43,178 44,092 45,670
Other expenses, net                 10,368 12,529 7,403
Total operating expenses 180,391 182,366 179,140 183,198 178,370 179,376 180,621 183,646 725,095 722,013 725,034
Operating income (loss) 65,484 64,021 65,643 61,067 63,808 67,467 65,797 65,278 256,215 262,350 249,019
Other items included in continuing operations                 (164,825) (194,875) (214,423)
Income from continuing operations $ 25,257 $ 23,769 $ 23,907 $ 18,457 $ 19,306 $ 18,186 $ 17,943 $ 12,040 91,390 67,475 34,596
Operating Segments [Member] | Conventional Real Estate Operations [Member]                      
Summary information for the reportable segments                      
Rental and other property revenues (3) [1]                 798,321 729,657 679,422
Total revenues                 798,321 729,657 679,422
Property operating expenses (3) [1]                 263,573 245,264 233,183
Total operating expenses                 263,573 245,264 233,183
Operating income (loss)                 534,748 484,393 446,239
Income from continuing operations                 534,748 484,393 446,239
Operating Segments [Member] | Affordable Real Estate Operations [Member]                      
Summary information for the reportable segments                      
Rental and other property revenues (3) [1]                 96,549 94,501 93,033
Total revenues                 96,549 94,501 93,033
Property operating expenses (3) [1]                 38,484 38,407 37,433
Provision for real estate impairment losses (3)                   0  
Total operating expenses                 38,484 38,407 37,433
Operating income (loss)                 58,065 56,094 55,600
Income from continuing operations                 58,065 56,094 55,600
Proportionate Adjustments [Member]                      
Summary information for the reportable segments                      
Rental and other property revenues (3) [1],[2]                 37,369 29,564 66,489
Total revenues [2]                 37,369 29,564 66,489
Property operating expenses (3) [1],[2]                 13,815 8,878 25,192
Total operating expenses [2]                 13,815 8,878 25,192
Operating income (loss) [2]                 23,554 20,686 41,297
Income from continuing operations [2]                 23,554 20,686 41,297
Corporate Nonsegment And Other Reconciling Items Member [Member]                      
Summary information for the reportable segments                      
Rental and other property revenues (3) [1],[3]                 24,715 99,109 100,287
Tax credit and asset management revenues [3]                 24,356 31,532 34,822
Total revenues [3]                 49,071 130,641 135,109
Property operating expenses (3) [1],[3]                 43,521 81,105 79,902
Investment management expenses                 5,855 [3] 7,310 [3] 4,341
Depreciation and amortization (3) [1],[3]                 306,301 282,608 291,910
Provision for real estate impairment losses (3) [3]                   1,820  
General and administrative expenses [3]                 43,178 44,092 45,670
Other expenses, net [3]                 10,368 12,529 7,403
Total operating expenses [3]                 409,223 429,464 429,226
Operating income (loss) [3]                 (360,152) (298,823) (294,117)
Other items included in continuing operations [3]                 (164,825) (194,875) (214,423)
Income from continuing operations [3]                 $ (524,977) $ (493,698) $ (508,540)
[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), 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 apartment communities and the results of consolidated apartment communities 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.
[3] Our basis for assessing segment performance excludes the results of apartment communities sold or classified as held for sale. As discussed in Note 2, effective January 1, 2014, we adopted ASU 2014-08, which revised the definition of a discontinued operation. In the segment presentation above, the current year and prior years' operating results for apartment communities sold or classified as held for sale during the years ended December 31, 2015 and 2014, are presented within the Corporate and Amounts Not Allocated to Segments column. The operating results for the year ended December 31, 2013, for apartment communities sold through December 31, 2013, are presented within discontinued operations and are accordingly excluded from the segment presentation above.