Other Data (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
State income tax expense:
Texas gross margin tax	$ 843	[1]	$ 459	[1]	$ 528	[1]
Michigan gross receipts deferred tax liability	0		(170)		(90)
Other	3		193		116
Total state income tax expense	846		482		554
State income tax payments, net of refunds and collections	$ 627		$ 522		$ 533

[1] In the table above, income tax expense for 2012 includes $0.1 million 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 Operations.