Income Tax Considerations (Schedule Of Income Tax Provision) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Income Tax Disclosure [Abstract]
Net income (loss) before taxes of taxable REIT subsidiary	$ 1,446		$ 10,688		$ (12,894)
Federal provision (benefit) at statutory rate of 35%	506		3,741		(4,513)
Valuation allowance (decrease) increase	(3,003)		2,165		3,781
Other	(149)		98		(705)
Federal income tax (benefit) provision of taxable REIT subsidiary	(2,646)	[1]	6,004	[1]	(1,437)	[1]
Texas franchise tax	1,403	[2]	1,370	[2]	1,784	[2]
Total	$ (1,243)		$ 7,374		$ 347

[1] All periods presented are open for examination by the IRS.

[2] For all periods presented, amounts include the effects that are reported in discontinued operations. See Note 15 for additional information.