Quarterly report pursuant to Section 13 or 15(d)

Accounts Payable and Accrued Liabilities (Details)

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Accounts Payable and Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accounts Payable and Accrued Liabilities    
Accounts payable $ 1,669us-gaap_AccountsPayableCurrent $ 1,503us-gaap_AccountsPayableCurrent
Severance and ad valorem tax payable 1,665us-gaap_AccruedEmployeeBenefitsCurrent 1,947us-gaap_AccruedEmployeeBenefitsCurrent
Payroll and other taxes 1,465us-gaap_AccruedPayrollTaxesCurrent 1,082us-gaap_AccruedPayrollTaxesCurrent
Accounts payable and accrued liabilities $ 4,799us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 4,532us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent