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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2015
Asset Retirement Obligation [Abstract] |
Estimated Fair Value of Company's Asset Retirement Obligations |
|  | Year Ended December 31, |  |  |  |  |  |  |
(in thousands) |  |  | 2015 |  |  | 2014 |  |  | 2013
Balance at January 1 |  | $ | 14,846 |  | $ | 11,464 |  | $ | 10,368
Accretion expense |  |  | 778 |  |  | 720 |  |  | 643
Additions |  |  | 1,085 |  |  | 2,526 |  |  | 453
Revisions |  |  | (543) |  |  | 136 |  |  | -
Balance at December 31 |  | $ | 16,166 |  | $ | 14,846 |  | $ | 11,464

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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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