Summary of Significant Accounting Policies (Details) $ in Thousands	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Deferred Finance Costs, Net		$ 0
Other assets	$ 398,417	428,899
Mortgage notes payable, net	4,147,999	4,685,134
Notes, net	$ 4,362,995	5,848,956
Properties	315
Apartment Units	79,458
Noncontrolling Interests – Partially Owned Properties	$ 4,278	4,608
Scenario, Previously Reported [Member]
Deferred Finance Costs, Net		54,004
Other assets		422,027
Mortgage notes payable, net		4,704,870
Notes, net		5,876,352
Partially Owned Properties – Consolidated
Properties	18
Apartment Units	3,471
Limited Life Partnership Properties [Member]
Properties	5
Noncontrolling Interests – Partially Owned Properties	$ 9,200
Noncontrolling Interests Settlement Value	54,600
Other assets
Deferred Finance Costs, Net	5,300
Mortgage notes payable, net
Deferred Finance Costs, Net	17,600
Notes, net
Deferred Finance Costs, Net	$ 23,800
Adjustments for New Accounting Pronouncement [Member]
Deferred Finance Costs, Net		(54,004)
Other assets		6,872
Mortgage notes payable, net		(19,736)
Notes, net		$ (27,396)