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Commitments (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Summary of Future Minimum Lease Payments for Non-Cancelable Operating Leases

The Company has several non-cancelable operating leases, primarily for rental of office space, that have a term of more than one year. The future minimum lease payments for the operating leases at December 31, 2017 are as follows.

(Thousands of dollars)		Operating Leases
2018		$	486
2019			172
Total minimum payments		$	658

Reconciliation of Liability for Plugging and Abandonment Costs

A reconciliation of the liability for plugging and abandonment costs for the years ended December 31, 2017 and 2016 is as follows:

		Year Ended December 31,
(Thousands of dollars)		2017				2016
Asset retirement obligation at beginning of period		$	17,505			$	11,737
Liabilities incurred			45				68
Liabilities settled			(676	)			(288	)
Accretion expense			768				498
Revisions in estimated liabilities			5,936				5,490
Asset retirement obligation at end of period		$	23,578			$	17,505

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Tabular disclosure for lessee's operating leases. Includes, but is not limited to, description of lessee's operating lease, existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
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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.

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