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Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2017

Asset Retirement Obligation Disclosure [Abstract]

Summary of Asset Retirement Obligation

The following table summarizes the changes in the reserve for future restoration and reclamation costs on the balance sheet:

		September 30,				December 31,
		2017				2016
(thousands of dollars)
Balance, beginning  of period		$	4,894			$	4,468
Liabilities settled			(37	)			(54	)
Liabilities disposed			(106	)
Accretion expense			395				480
Balance, end of period			5,146				4,894
Less:  Current portion			(121	)			(121	)
Less:  Liabilities held for sale			-				(105	)
Non-current portion		$	5,025			$	4,668

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- References

No definition available.

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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

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