Description Of Business And Segment Reporting (Reconciliation To Net Income Attributable To Common Shareholders) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Segment operating income (loss)	$ (12,031)	$ (28,483)	$ (41,793)
Depreciation and amortization expense	(18,422)	(20,918)	(22,746)
General and administrative expense	(20,172)	(21,416)	(25,100)
Equity earnings of unconsolidated joint ventures	456	271	258
Gain (loss) on sale of assets	562	(54)	92,219
Other income (expense)	(164)	6,817	3,762
Income (loss) before income taxes	(30,595)	(35,841)	40,758
Operating Segments [Member]
Segment Reporting Information [Line Items]
Segment operating income (loss)	3,915	(11,210)	(23,992)
Depreciation and amortization expense	(17,711)	(19,846)	(21,514)
Unallocated Corporate Expense [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization expense	(711)	(1,072)	(1,232)
General and administrative expense	(15,235)	(16,201)	(16,569)
Interest expense, net	(19,418)	(14,392)	(13,688)
Equity earnings of unconsolidated joint ventures	456	271	258
Gain (loss) on sale of assets	562	(54)	92,219
Other income (expense)	(164)	6,817	3,762
Income (loss) before income taxes	$ (30,595)	$ (35,841)	$ 40,758