Description Of Business And Segment Reporting (Reconciliation To Net Income Attributable To Common Shareholders) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Operating income	$ 4,539	$ 3,667	$ 18,849	$ 17,012
Depreciation and amortization expense	(5,829)	(4,137)	(16,705)	(12,124)
General and administrative expense	(6,489)	(5,840)	(21,250)	(18,131)
Interest expense, net	(1,748)	(1,663)	(5,132)	(5,310)
Equity earnings of unconsolidated joint ventures	80	136	667	654
Gain on sale of assets				9,417
Gain on insurance recoveries				9,217
Other income (expense)	(130)	89	(273)	937
Income before income taxes	2,741	2,229	14,111	31,927
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	9,462	8,281	35,879	31,264
Unallocated Corporate Expense [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization expense	(92)	(108)	(313)	(321)
General and administrative expense	(4,831)	(4,506)	(16,717)	(13,931)
Interest expense, net	$ (1,748)	$ (1,663)	$ (5,132)	$ (5,310)