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Real Estate Acquisitions and Dispositions (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
property
Dec. 31, 2014
USD ($)
property
Dec. 31, 2013
USD ($)
Properties acquired | property 4 6  
Property Units Acquired 625 1,353  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets $ 323,837 $ 498,640  
Investment in real estate 25,182,352 27,675,383  
Other Liabilities $ 366,387 $ 389,915  
Disposed Properties | property 8 11  
Disposed Units 1,857 3,480  
Proceeds From Sale Of Property $ 513,312 $ 592,070  
Net gain on sales of real estate properties 335,134 212,685 $ 0
Net (loss) gain on sales of land parcels $ (1) 5,277 $ 12,227
Series P [Domain]      
Investment in real estate   87,500  
Business combination, consideration transferred   64,200  
Payments to Acquire Interest in Subsidiaries and Affiliates   44,800  
Other Liabilities   18,400  
Revaluation Loss   $ 3,500  
Consolidated Rental Properties [Member]      
Properties acquired | property 4 6  
Property Units Acquired 625 1,353  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets $ 296,037 $ 469,850  
Disposed Properties | property 8 10  
Disposed Units 1,857 3,092  
Proceeds From Sale Of Property $ 513,312 $ 466,968  
Consolidated Rental Properties [Member] | Land [Member]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 44,700 95,300  
Consolidated Rental Properties [Member] | Depreciable Property [Member]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets $ 251,300 374,600  
Land [Member]      
Land parcels acquired 3    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets $ 27,800 $ 28,790  
Disposed Land Parcels 0 3  
Proceeds From Sale Of Property   $ 62,602  
Commercial Real Estate [Member]      
Commercial Properties Disposed 1 0  
Proceeds From Sale Of Property $ 123,300    
Unconsolidated Properties [Member]      
Disposed Properties | property   1  
Disposed Units   388  
Proceeds From Sale Of Property   $ 62,500  
Equity Method Investment, Ownership Percentage   85.00%  
Unconsolidated Properties [Member]      
Equity Method Investment, Realized Gain (Loss) on Disposal   $ 4,900  
Series P [Domain]      
Business Acquisition, Percentage of Voting Interests Acquired   95.00%