Income Tax Considerations (Schedule Of Income Tax Provision) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Net income (loss) before taxes of taxable REIT subsidiary	$ 13,480	$ (5,788)	$ 20,295
Federal provision (benefit) (1)	2,831	(2,026)	7,103
Valuation allowance decrease	(2,800)	0	(1,251)
Effect of change in statutory rate on net deferrals	0	282	0
Other	(46)	176	(54)
Federal income tax provision (benefit) of taxable REIT subsidiary (2)	(15)	(1,568)	5,798
State and local taxes, primarily Texas franchise taxes	1,393	1,551	1,058
Total	$ 1,378	$ (17)	$ 6,856