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Acquisitions, Dispositions, Impairment, and Discontinued Operations (Narrative) (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 15, 2018
USD ($)
Apr. 28, 2017
USD ($)
a
Jan. 31, 2018
USD ($)
Apr. 30, 2016
USD ($)
Feb. 29, 2016
USD ($)
a
Mar. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
a
Dec. 31, 2015
USD ($)
Jan. 11, 2018
Jun. 01, 2017
Apr. 26, 2016
a
Property, Plant and Equipment [Line Items]                            
Property operating and maintenance                 $ 217,817,000 $ 206,780,000 $ 202,105,000      
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions [1]                 $ 6,822,000 [2] $ 7,125,000 $ 6,168,000      
Number of Operating properties Acquired                 1          
Number of joint ventures accounted for under equity method investments                 3 3 3      
Area of Land | a   8.2               4.6        
Purchase price of land acquired   $ 20,000,000               $ 19,900,000        
Gain on sale of operating properties, including land                 $ 43,231,000 295,397,000 $ 104,288,000      
Number of Units in Real Estate Property                         250  
Payments to Acquire Real Estate                 58,267,000 0 0      
Gain (Loss) on Sale of Properties             $ 262,719,000 $ 32,235,000            
Noncontrolling Interest, Increase from Business Combination                 $ 0 0 9,500,000      
Current Fiscal Year End Date                 --12-31          
Gain on sale of discontinued operations, net of tax                 $ 0 375,237,000 0      
Corporate Joint Venture [Member]                            
Property, Plant and Equipment [Line Items]                            
Business Acquisition, Percentage of Voting Interests Acquired           0.01%                
Number of Businesses Acquired           2                
Number of Units in Real Estate Property           798                
Noncontrolling Interest, Increase from Business Combination           $ 9,500,000                
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]                            
Property, Plant and Equipment [Line Items]                            
Area of Land | a         6.3                  
Proceeds from Sale of Land Held-for-investment         $ 2,200,000           1,100,000      
Gains (Losses) on Sales of Investment Real Estate                   $ 400,000 $ 300,000      
Number of Real Estate Properties             5 1 1 6 3      
Number of Units in Real Estate Property                 1,005 3,184 1,376      
Proceeds from Sale of Property, Plant, and Equipment                 $ 78,400,000 $ 523,400,000 $ 147,400,000      
Gain (Loss) on Sale of Properties                   $ 294,900,000 $ 104,000,000      
Weighted average age of operating properties                   24        
Land                     2      
Dual-Phase Property Sale [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]                            
Property, Plant and Equipment [Line Items]                            
Number of Real Estate Properties             1     1        
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]                            
Property, Plant and Equipment [Line Items]                            
Area of Land | a                           19.6
Number of Real Estate Properties                           15
Number of Units in Real Estate Property                           4,918
Proceeds from Sale of Property, Plant, and Equipment       $ 630,000,000                    
Weighted average age of operating properties                           23
Subsequent Event [Member]                            
Property, Plant and Equipment [Line Items]                            
Number of Operating properties Acquired     1                      
Number of Units in Real Estate Property                       358    
Payments to Acquire Real Estate     $ 126,900,000                      
Subsequent Event [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]                            
Property, Plant and Equipment [Line Items]                            
Number of Operating properties Acquired 1                          
Number of Units in Real Estate Property 333                          
Payments to Acquire Real Estate $ 81,400,000                          
Hurricane [Member]                            
Property, Plant and Equipment [Line Items]                            
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions                 $ 400,000          
[1] Equity in income excludes our ownership interest of fee income from various services provided by us to the Funds
[2] Equity in income for the year ended December 31, 2017 includes our ownership interest of the hurricane related expenses of approximately $0.4 million.