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Asset Retirement Obligation | 12 Months Ended
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Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | 12. Asset Retirement Obligation The Company had recorded a post-closure reclamation and site restoration obligation of $1,384 at December 31, 2016. The following is a reconciliation of the total reclamation liability for asset retirement obligations.
Balance at December 31, 2014 |  | $ | 1,765 |
Additions to liabilities |  |  | 105 |
Reductions to liabilities due to revision of estimates |  |  | (719 | )
Accretion expenses |  |  | 29 |
Balance at December 31, 2015 |  |  | 1,180 |
Additions to liabilities |  |  | 399 |
Reductions to liabilities due to revision of estimates |  |  | (211 | )
Accretion expenses |  |  | 16 |
Balance at December 31, 2016 |  | $ | 1,384 |

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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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