Description Of Business And Segment Reporting (Reconciliation To Net Income Attributable To Common Shareholders) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Segment operating income (loss)	$ (1,572)	$ (12,532)	$ (13,349)	$ (26,510)
Depreciation and amortization expense	(5,247)	(5,801)	(10,771)	(11,451)
General and administrative expense	(6,312)	(8,834)	(12,107)	(13,931)
Equity earnings of unconsolidated joint ventures	237	283	172	233
Gain (loss) on sale of assets		43,241		89,786
Other income (expense)	3,773	154	2,990	1,795
Income (loss) before income taxes	(905)	28,141	(16,735)	57,936
Operating Segments [Member]
Segment Reporting Information [Line Items]
Segment operating income (loss)	3,364	(8,399)	(3,744)	(18,044)
Unallocated Corporate Expense [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization expense	(268)	(387)	(546)	(618)
General and administrative expense	(4,668)	(3,746)	(9,059)	(7,848)
Interest expense, net	$ (3,343)	$ (3,005)	$ (6,548)	$ (7,368)