Summary Of Significant Accounting Policies (Changes For The Adoption Of ASC 842 and ASC 606) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating properties, net	$ 258,138	$ 258,037	$ 257,667
Operating lease right-of-use assets	229,879	232,319
Intangible assets, net	4,320	3,827	7,369
Deferred tax assets, net	3,444	26,526	26,444	$ 24,585
Deferred current revenue	11,324		9,264	9,495
Operating lease liabilities	20,379	245,280
Other non-current liabilities	18,854	12,898	28,931
Non-controlling interests	4,267	4,291	4,337
Retained earnings	20,647	$ 47,076	47,048	$ 33,250
As Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating properties, net	258,138		257,667
Operating lease right-of-use assets	229,879
Intangible assets, net	4,320		7,369
Deferred tax assets, net	3,444		26,444		$ 24,746
Deferred current revenue					9,850
Operating lease liabilities	20,379
Other non-current liabilities	18,854		28,931
Non-controlling interests			4,337
Retained earnings	$ 139,616		47,048		33,056
Adjustments [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets, net					(161)
Deferred current revenue					(355)
Retained earnings					$ 194
Adjustments [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating properties, net			370
Operating lease right-of-use assets			232,319
Intangible assets, net			(3,542)
Deferred tax assets, net			82
Operating lease liabilities			245,280
Other non-current liabilities			(16,033)
Non-controlling interests			(46)
Retained earnings			$ 28