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Commitments (Tables)

12 Months Ended

Dec. 31, 2013

Commitments And Contingencies Disclosure [Abstract]

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

 The future minimum lease payments for the operating leases at December 31, 2013 are as follows.

(Thousands of dollars)		Operating Leases
2014		$	747
2015			651
2016			545
2017			46
Total minimum payments		$	1,989

Reconciliation of Liability for Plugging and Abandonment Costs

A reconciliation of the liability for plugging and abandonment costs for the years ended December 31, 2013 and 2012 is as follows:

		Year Ended December 31,
(Thousands of dollars)		2013				2012
Asset retirement obligation at beginning of period		$	9,012			$	19,013
Liabilities incurred			338				733
Loss on settlement of obligations			40				—
Liabilities settled			(776	)			(15,361	)
Accretion expense			394				1,053
Revisions in estimated liabilities			1,529				3,574
Asset retirement obligation at end of period		$	10,537			$	9,012

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Tabular disclosure of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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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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