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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Operating income (loss)	$ (22,195)	$ 5,730	$ (29,235)	$ 4,370
Depreciation and amortization expense	(5,266)	(5,572)	(10,537)	(11,166)
General and administrative expense	(5,102)	(6,034)	(11,047)	(12,518)
Equity earnings of unconsolidated joint ventures	(274)	327	(195)	361
Other income (expense)	19	71	(196)	50
Income (loss) before income taxes	(24,454)	3,924	(33,423)	727
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(18,061)	10,527	(20,528)	14,269
Unallocated Corporate Expense [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization expense	(227)	(127)	(419)	(188)
General and administrative expense	(3,907)	(4,670)	(8,288)	(9,710)
Interest expense, net	$ (2,004)	$ (2,204)	$ (3,797)	$ (4,055)