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Other Long-Term Obligations and Commitments (Tables)

6 Months Ended

Jun. 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		$	267
2019			236
2020			69
2021			17
Total minimum payments		$	589

Reconciliation of Liability for Plugging and Abandonment Costs

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

(Thousands of dollars)
Asset retirement obligation – December 31, 2017		$	23,578
Liabilities incurred			—
Liabilities settled			(1,114	)
Accretion expense			560
Asset retirement obligation – June 30, 2018		$	23,024

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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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