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Assets Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract] |
Summary of Asset Retirement Obligation | 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 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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