Summary Of Significant Accounting Policies (Balance With And Without The Adoption Of ASC 842 On The Balance Sheet) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating property, net	$ 255,761	$ 258,037	$ 257,667
Operating lease right-of-use assets	224,878	232,319
Intangible assets, net	3,659	3,827	7,369
Deferred tax asset, net	26,336	26,317	26,235
Operating lease liabilities, current	19,658	245,280
Other non-current liabilities	12,525	12,898	28,931
Noncontrolling interests	4,223	4,291	4,337
Retained earnings	$ 47,957	$ 47,644	47,616
As Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating property, net			257,667
Intangible assets, net			7,369
Deferred tax asset, net			26,235
Other non-current liabilities			28,931
Noncontrolling interests			4,337
Retained earnings			47,616
Adjustments [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, current			245,280
Other non-current liabilities			(16,033)
Noncontrolling interests			(46)
Retained earnings			$ 28