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Other Long-Term Obligations and Commitments (Tables)

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

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

The payment schedule for the Company’s operating and financing lease obligations as of June 30, 2019 is as follows:

(Thousands of dollars)		Operating Leases				Financing Leases
2019		$	299			$	5
2020			155				7
2021			17				2
Total undiscounted lease payments		$	471			$	14
Less: Amount associated with discounting			(19	)			(1	)
Net operating lease liabilities		$	452			$	13

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, 2019 is as follows:

(Thousands of dollars)		June 30, 2019
Asset retirement obligation at December 31, 2018		$	21,334
Liabilities incurred			—
Liabilities settled			(829	)
Accretion expense			560
Revisions in estimated liabilities			—
Asset retirement obligation at June 30, 2019		$	21,065

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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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