Income Tax Considerations (Schedule Of Income Tax Provision) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Net income (loss) before taxes of taxable REIT subsidiary	$ 20,295	$ (989)	$ 1,446
Federal provision (benefit) at statutory rate of 35%	7,103	(346)	506
Valuation allowance decrease	(1,251)	(309)	(3,003)
Other	(54)	6	(149)
Federal income tax provision (benefit) of taxable REIT subsidiary (1)	5,798	(649)	(2,646)
Texas franchise tax	1,058	701	1,403
Total	$ 6,856	$ 52	$ (1,243)