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Other Long-Term Obligations and Commitments (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

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

The future minimum lease payments for the rest of fiscal 2018 and thereafter for the operating leases are as follows:

(Thousands of dollars)		Operating Leases
2018		$	133
2019			222
2020			69
2021			17
Total minimum payments		$	441

Reconciliation of Liability for Plugging and Abandonment Costs

A reconciliation of the liability for plugging and abandonment costs for the nine months ended September 30, 2018 is as follows:

(Thousands of dollars)
Asset retirement obligation – December 31, 2017		$	23,578
Liabilities incurred			42
Liabilities settled			(1,967	)
Accretion expense			840
Asset retirement obligation – September 30, 2018		$	22,493

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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.

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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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