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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of changes in Company's asset retirement obligations | The following table summarizes the changes in the Company’s asset retirement obligations for the years ended December 31, 2016 and 2015 (in thousands).
|  | Year Ended December 31,
|  | 2016 |  | 2015
Beginning asset retirement obligations |  | $ | 15,420 |  |  | $ | 11,951 |
Liabilities incurred during period |  | 1,791 |  |  | 4,508 |
Liabilities settled during period |  | (375 | ) |  | (588 | )
Revisions in estimated cash flows |  | 2,622 |  |  | (1,185 | )
Accretion expense |  | 1,182 |  |  | 734 |
Ending asset retirement obligations |  | 20,640 |  |  | 15,420 |
Less: current asset retirement obligations (1) |  | (915 | ) |  | (254 | )
Long-term asset retirement obligations |  | $ | 19,725 |  |  | $ | 15,166 |
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(1) | Included in accrued liabilities in the Company’s consolidated balance sheets at December 31, 2016 and 2015.

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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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