Description Of Business And Segment Reporting (Reconciliation To Net Income Attributable To Common Shareholders) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Segment operating income (loss)	$ (11,780)	$ (13,977)
Depreciation and amortization expense	(5,524)	(5,650)
General and administrative expense	(5,796)	(5,097)
Equity earnings of unconsolidated joint ventures	(65)	(50)
Gain (loss) on sale of assets		46,545
Other income (expense)	(781)	1,641
Income (loss) before income taxes	(15,831)	29,796
Operating Segments [Member]
Segment Reporting Information [Line Items]
Segment operating income (loss)	(7,112)	(9,643)
Unallocated Corporate Expense [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization expense	(277)	(231)
General and administrative expense	(4,391)	(4,103)
Interest expense, net	$ (3,205)	$ (4,363)