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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Operating income (loss)	$ 2,910	$ 4,539	$ 7,425	$ 18,849
Depreciation and amortization expense	(5,704)	(5,829)	(16,870)	(16,705)
General and administrative expense	(5,908)	(6,489)	(18,426)	(21,250)
Equity earnings of unconsolidated joint ventures	220	80	581	667
Gain (loss) on sale of assets	(1)		(1)
Other income (expense)	141	(130)	190	(273)
Income (loss) before income taxes	1,399	2,741	2,271	14,111
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	7,506	9,462	21,918	35,879
Unallocated Corporate Expense [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization expense	(103)	(92)	(288)	(313)
General and administrative expense	(4,493)	(4,831)	(14,205)	(16,717)
Interest expense, net	$ (1,871)	$ (1,748)	$ (5,924)	$ (5,132)