Income Taxes (Details) (USD $)			3 Months Ended	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012 Internal Revenue Service (IRS)	Sep. 30, 2013 Internal Revenue Service (IRS)	Sep. 30, 2013 State Jurisdiction (Texas)
Tax Audits [Abstract]
Year(s) no longer subject to audit as statute of limitations has expired				2008
Earliest year subject to examination				2009	2009
Year(s) under examination			2010 and 2011		None
Unrecognized Tax Benefits [Abstract]
Unrecognized tax benefit - Permanent tax positions	$ 300,000	$ 200,000
Unrecognized tax benefit - Temporary tax positions	3,800,000	3,700,000
Total unrecognized tax benefit	4,100,000	3,900,000
NOL and tax credit carryforwards	(2,400,000)	(2,000,000)
Upper bound of decrease in unrecognized tax benefit that is reasonably possible	(4,000,000)
Amounts accrued for penalties related to unrecognized tax benefits	$ 0	$ 0