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ASSET RETIREMENT OBLIGATIONS (Tables) | 6 Months Ended
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Jun. 30, 2019
Schedule of reconciliation of asset retirement obligations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2019 |  | December 31, 2018
Asset retirement obligation liability, beginning balance | ​ | $ | 29,402 | ​ | $ | 24,722
Settlements | ​ |  | (127) | ​ |  | (392)
Accretion of liability | ​ |  | 800 | ​ |  | 1,205
Adjustment reflecting updated estimates | ​ |  | 4,304 | ​ |  | 5,024
Foreign exchange revaluation | ​ | ​ | 610 | ​ | ​ | (1,157)
Asset retirement obligation liability, ending balance | ​ | $ | 34,989 | ​ | $ | 29,402
Current portion | ​ | ​ | (1,218) | ​ | ​ | (734)
Long-term portion | ​ | $ | 33,771 | ​ | $ | 28,668

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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://fasb.org/us-gaap/role/ref/legacyRef -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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