Description Of Business And Segment Reporting (Schedule Of Operating Property By Country) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total operating property	$ 264,724	$ 211,886	[1]
United States [Member]
Segment Reporting Information [Line Items]
Total operating property	89,183	75,845
Australia [Member]
Segment Reporting Information [Line Items]
Total operating property	143,200	103,430
New Zealand [Member]
Segment Reporting Information [Line Items]
Total operating property	$ 32,341	$ 32,611

[1] Certain prior year balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).