Summary Of Significant Accounting Policies (Changes For The Adoption Of ASC 842 and ASC 606) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating property, net	$ 353,125	$ 258,138	$ 258,037
Operating lease right-of-use assets	220,503	229,879	232,319
Intangible assets, net	3,971	4,320	3,827
Deferred tax asset, net	3,362	3,444	26,526
Deferred revenue	10,133	11,324
Operating lease liabilities	22,699	20,379	245,280
Other non-current liabilities	22,017	18,854	12,898
Non-controlling interests	3,404	4,267	4,291
Retained earnings (deficit)	(44,553)	20,647	$ 47,076
As Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating property, net	353,125	258,138		$ 257,667
Operating lease right-of-use assets	220,503	229,879
Intangible assets, net	3,971	4,320		7,369
Deferred tax asset, net	3,362	3,444		26,444
Operating lease liabilities	22,699	20,379
Other non-current liabilities	22,017	18,854		28,931
Non-controlling interests				4,337
Retained earnings (deficit)	$ 81,173	139,616		$ 47,048
Adjustments [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating property, net		370
Operating lease right-of-use assets		232,319
Intangible assets, net		(3,542)
Deferred tax asset, net		82
Operating lease liabilities		245,280
Other non-current liabilities		(16,033)
Non-controlling interests		(46)
Retained earnings (deficit)		$ 28