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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Operating income	$ 8,574	$ 7,760	$ 14,216	$ 13,291	[1]
Depreciation and amortization expense	(5,626)	(4,054)	(10,877)	(7,987)	[1]
General and administrative expense	(7,165)	(6,118)	(14,761)	(12,291)	[1]
Interest expense, net	(1,790)	(1,787)	(3,384)	(3,647)	[1]
Income tax benefit (expense)	(1,953)	(5,846)	(3,108)	(7,549)	[1]
Equity earnings of unconsolidated joint ventures	331	264	588	518	[1]
Gain on sale of assets		9,417		9,417	[1]
Gain on insurance recoveries		9,217		9,217	[1]
Other income (expense)	(61)	27	(143)	848	[1]
Income before income taxes	7,054	24,898	11,277	29,644	[1]
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	14,408	12,544	26,323	22,930
Corporate, Non-segment [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization expense	(104)	(110)	(221)	(214)
General and administrative expense	(5,730)	(4,674)	(11,886)	(9,425)
Interest expense, net	$ (1,790)	$ (1,787)	$ (3,384)	$ (3,647)

[1] Certain prior year balances have been reclassified to conform to the 2018 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).