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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Segment operating income (loss)	$ (6,731)	$ (10,951)	$ (20,080)	$ (37,461)
Depreciation and amortization expense	(5,010)	(5,560)	(15,781)	(17,011)
General and administrative expense	(5,257)	(5,274)	(17,364)	(19,205)
Equity earnings of unconsolidated joint ventures	61	(75)	233	158
Gain (loss) on sale of assets	(59)	2,559	(59)	92,345
Other income (expense)	5,455	440	8,445	2,236
Income (loss) before income taxes	(4,967)	(11,095)	(21,703)	46,841
Operating Segments [Member]
Segment Reporting Information [Line Items]
Segment operating income (loss)	(2,282)	(6,542)	(6,027)	(24,587)
Unallocated Corporate Expense [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization expense	(258)	(300)	(804)	(917)
General and administrative expense	(4,190)	(4,109)	(13,249)	(11,957)
Interest expense, net	$ (3,694)	$ (3,068)	$ (10,242)	$ (10,437)