Schedule III Properties And Accumulated Depreciation (Summary Of Historical Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance, beginning of year	$ 17,055,016	$ 16,915,936	$ 11,558,469
Additions during period (acquisitions and improvements)	833,836	223,163	5,663,404
Deductions during period (dispositions, impairments and assets held for sale)	(1,002,260)	(84,083)	(305,937)
Balance, end of year	$ 16,886,592	$ 17,055,016	$ 16,915,936