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Asset Retirement Obligation | 12 Months Ended
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Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | 8. ASSET RETIREMENT OBLIGATION The Company’s mining and exploration activities are subject to various state and federal law and regulations governing the protection of the environment. The Company conducts its operations to protect public health and the environment and believes its operations are in compliance with the applicable laws and regulations in all material respects. The Company has made, and expects to make in the future, expenditures to comply with such laws and regulations, but cannot predict the full amount of such future expenditures. Estimated future restoration and reclamation costs are based principally on legal and regulatory requirements. Changes to the Company’s asset retirement obligation are summarized below:
|  | December 31, |
|  | 2014 |  |  | 2013 |
Balance, beginning of period |  | $ | 3,834 |  |  | $ | 4,498 |
Additions, changes in estimates and other |  |  | 136 |  |  |  | 584 |
Liabilities settled |  |  | (199 | ) |  |  | (1,638 | )
Accretion expense |  |  | 425 |  |  |  | 390 |
Balance, end of period |  |  | 4,196 |  |  |  | 3,834 |
Less: Current portion |  |  | (196 | ) |  |  | - |
Non-current Portion |  | $ | 4,000 |  |  | $ | 3,834 |
Additions and changes in estimates during the year ended December 31, 2014 were primarily related to changes in estimated timing of when the restoration and reclamation activities will occur along with changes in the costs estimated for plugging and abandonment activities at our South Texas ISR projects. As of December 31, 2014, the Company’s ARO was fully secured by surety bonds totaling $9,169, which were partially collateralized with restricted cash totaling $3,941.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 + Details
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