Income Tax Considerations (Schedule Of Income Tax Provision) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net income (loss) before taxes of taxable REIT subsidiary	$ 32,602	$ 13,480	$ (5,788)
Federal provision (benefit)	6,846	2,831	(2,026)
Valuation allowance decrease	(7,038)	(2,800)	0
Effect of change in statutory rate on net deferrals	0	0	282
Other	569	(46)	176
Federal income tax provision (benefit) of taxable REIT subsidiary	377	(15)	(1,568)
State and local taxes, primarily Texas franchise taxes	663	1,393	1,551
Total	$ 1,040	$ 1,378	$ (17)