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Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis

 The following fair value hierarchy table presents information about the Company’s assets and liabilities measured at fair value on a recurring basis at June 30, 2018 and December 31, 2017:

June 30, 2018		Quoted Prices in Active Markets For Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)				Balance at June 30, 2018
(Thousands of dollars)
Assets
Commodity derivative contracts		$	—			$	—			$	92			$	92
Total assets			—			$	—			$	92			$	92
Liabilities
Commodity derivative contracts		$	—			$	—			$	(9,083	)		$	(9,083	)
Total liabilities		$	—			$	—			$	(9,083	)		$	(9,083	)
December 31, 2017		Quoted Prices in Active Markets For Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)				Balance at December 31, 2017
(Thousands of dollars)
Assets
Commodity derivative contracts		$	—			$	—			$	388			$	388
Total assets		$	—			$	—			$	388			$	388
Liabilities
Commodity derivative contract		$	—			$	—			$	(3,422	)		$	(3,422	)
Total liabilities		$	—			$	—			$	(3,422	)		$	(3,422	)

Schedule of Changes in Fair Value of Financial Assets and Liabilities Classified as Level 3

The following table sets forth a reconciliation of changes in the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy for the six months ended June 30, 2018.

(Thousands of dollars)
Net Liabilities – December 31, 2017		$	(3,034	)
Total realized and unrealized gains (losses):
Included in earnings (a)			(7,533	)
Purchases, sales, issuances and settlements			1,576
Net Liabilities – June 30, 2018		$	(8,991	)

a) Derivative instruments are reported in revenues as realized gain (loss) and on a separately reported line item captioned unrealized gain (loss) on derivative instruments.

Effect of Derivative Instruments on Consolidated Balance Sheets

The following table sets forth the effect of derivative instruments on the consolidated balance sheets at June 30, 2018 and December 31, 2017:

						Fair Value
(Thousands of dollars)		Balance Sheet Location				June 30, 2018				December 31, 2017
Asset Derivatives:
Derivatives not designated as cash-flow hedging instruments:
Natural gas commodity contracts			Other Current Assets			$	61			$	—
Natural gas liquid contracts			Other Current Assets				7				—
Crude oil commodity contracts			Other Current Assets				—				344
Natural gas commodity contracts			Other Assets				18				44
Natural gas liquid contracts			Other Assets				6				—
Total						$	92			$	388
Liability Derivatives:
Derivatives not designated as cash-flow hedging instruments:
Crude oil commodity contracts			Derivative liability short-term				(5,503	)			(1,504	)
Natural gas commodity contracts			Derivative liability short-term				(24	)			(4	)
Natural gas liquid contracts			Derivative liability short-term				(189	)			—
Crude oil commodity contracts			Derivative liability long-term				(3,343	)			(1,910	)
Natural gas commodity contracts			Derivative liability long-term				(3	)			(4	)
Natural gas liquid contracts			Derivative liability long-term				(21	)			—
Total						$	(9,083	)		$	(3,422	)
Total derivative instruments						$	(8,991	)		$	(3,034	)

Effect of Derivative Instruments on Consolidated Statements of Operations

The following table sets forth the effect of derivative instruments on the consolidated statements of operations for the six month period ended June 30, 2018 and 2017:

		Location of gain (loss) recognized in income		Amount of gain (loss) recognized in income
(Thousands of dollars)				2018				2017
Derivatives not designated as cash-flow hedge instruments:
Natural gas commodity contracts		Unrealized (loss) gain on derivative instruments, net		$	(328	)		$	1,852
Crude oil commodity contracts		Unrealized (loss) gain on derivative instruments, net		$	(5,432	)			2,502
Natural gas liquids contracts		Unrealized gain on derivative instruments, net			(197	)			—
Natural gas commodity contracts		Realized (loss) on derivative instruments, net			85				(205	)
Crude oil commodity contracts		Realized (loss) on derivative instruments, net			(1,634	)			(—	)
Natural gas liquids contracts		Realized gain on derivative instruments, net			(27	)			—
				$	(7,533	)		$	4,149

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Tabular disclosure of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) using recurring unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
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Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4E
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959

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Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.

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Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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