Description Of Business And Segment Reporting (Reconciliation To Net Income Attributable To Common Shareholders) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Segment operating income (loss)	$ (28,483)	$ (41,793)	$ (61,313)
Depreciation and amortization expense	(20,918)	(22,746)	(22,317)
General and administrative expense	(21,416)	(25,100)	(16,998)
Equity earnings of unconsolidated joint ventures	271	258	(449)
Gain (loss) on sale of assets	(54)	92,219	(1)
Other income (expense)	6,817	3,762	293
Income (loss) before income taxes	(35,841)	40,758	(70,824)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Segment operating income (loss)	(11,210)	(23,992)	(47,519)
Depreciation and amortization expense	(19,846)	(21,514)	(21,347)
Unallocated Corporate Expense [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization expense	(1,072)	(1,232)	(970)
General and administrative expense	(16,201)	(16,569)	(12,824)
Interest expense, net	(14,392)	(13,688)	(9,354)
Equity earnings of unconsolidated joint ventures	271	258	(449)
Gain (loss) on sale of assets	(54)	92,219	(1)
Other income (expense)	6,817	3,762	293
Income (loss) before income taxes	$ (35,841)	$ 40,758	$ (70,824)