Description Of Business And Segment Reporting (Reconciliation To Net Income Attributable To Common Shareholders) (Details) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 NZD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Operating income	$ 24,078		$ 20,706	$ 20,704	[1]
Depreciation and amortization expense	(22,275)		(16,942)	(15,689)	[1]
General and administrative expense	(27,337)		(25,347)	(26,906)	[1]
Interest expense, net	(6,837)		(6,194)	(6,782)	[1]
Equity earnings of unconsolidated joint ventures	974		815	999	[1]
(Loss) gain on sale of assets	(41)		9,360	393	[1]
Casualty gain (loss)		$ 12.7	9,217	(1,421)	[1]
Other (expense) income	(256)		588	(63)	[1]
Income before income taxes	17,918		34,492	13,830	[1]
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	45,759		41,126	42,820
Depreciation and amortization expense	(21,881)		(16,469)	(15,294)
Unallocated Corporate Expense [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization expense	(394)		(473)	(395)
General and administrative expense	(21,287)		(19,947)	(21,721)
Interest expense, net	(6,837)		(6,194)	(6,782)
Equity earnings of unconsolidated joint ventures	974		815	999
(Loss) gain on sale of assets	(41)		9,360	393
Casualty gain (loss)			9,217	(1,421)
Other (expense) income	(256)		588	(63)
Income before income taxes	$ 17,918		$ 34,492	$ 13,830

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