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Asset Retirement Obligation (Tables) | 12 Months Ended
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Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract] |
Summary of Asset Retirement Obligation | Changes to the Company’s asset retirement obligation are summarized below:
|  | December 31, 2017 |  |  | December 31, 2016 |
|  | (thousands of dollars) |
Balance, beginning of period |  | $ | 4,789 |  |  | $ | 4,468 |
Liabilities settled |  |  | (97 | ) |  |  | (54 | )
Accretion expense |  |  | 1,039 |  |  |  | 480 |
Balance, end of period |  |  | 5,731 |  |  |  | 4,894 |
Less: Included in liabilities held for sale |  |  | - |  |  |  | (105 | )
Less: Current portion |  |  | (1,078 | ) |  |  | (121 | )
Non-current portion |  | $ | 4,653 |  |  | $ | 4,668 |

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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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