Income Taxes (Details Narrative) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Net operating loss carryforward	102,000
Texas margin tax maximum effective rate	0.70%
Minimum
Net operating loss carryforward expiration date	Dec. 31, 2018
Maximum
Net operating loss carryforward expiration date	Dec. 31, 2034
Federal Income Tax | Minimum
Tax years open for examination	2011
Federal Income Tax | Maximum
Tax years open for examination	2014
Texas Franchise Tax | Minimum
Tax years open for examination	2010
Texas Franchise Tax | Maximum
Tax years open for examination	2014
Alternative Minimum Tax
Other tax carryforwards	88,000
Alternative Minimum Tax | Minimum
Other tax carryforwards expiration date	Dec. 31, 2018
Alternative Minimum Tax | Maximum
Other tax carryforwards expiration date	Dec. 31, 2034
Statutory Depletion
Other tax carryforwards	9,000
Capital Loss
Other tax carryforwards	2,000
Capital Loss | Minimum
Other tax carryforwards expiration date	Dec. 31, 2015
Capital Loss | Maximum
Other tax carryforwards expiration date	Dec. 31, 2015