Schedule III Properties And Accumulated Depreciation (Summary Of Accumulated Depreciation And Amortization) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance, beginning of year	$ 3,935,267	$ 3,238,227	$ 2,668,509
Additions during period (depreciation and amortization expense)	805,916	714,336	612,970
Deductions during period (dispositions and assets held for sale)	(205,014)	(17,296)	(43,252)
Balance, end of year	$ 4,536,169	$ 3,935,267	$ 3,238,227