Other Data (Details 2) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
State income tax expense:
Texas gross margins tax	[1]	$ 528	$ 694	$ 649
Other		37	58	23
Total state income tax expense		565	752	672
State income tax payments, net of refunds and collections		758	593	$ 768
Income tax expense in discontinued operations		$ 50	$ 50

[1] In the table above, income tax expense for 2015 and 2014 includes approximately $50 thousand that was recorded to the gain on sale of real estate properties sold, which is included in discontinued operations rather than general and administrative expenses on the Company’s Consolidated Statements of Income.