Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Available-for-sale Securities [Table Text Block]

The following is a summary of available-for-sale securities:

	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(In thousands)
Equity Securities:
December 31, 2018	$	830	$	—	$	636	$	194
December 31, 2017	$	830	$	102	$	—	$	932

Recurring Fair Value Measurements [Table Text Block]

The following tables set forth our recurring fair value measurements:

	December 31, 2018
	Level 2		Level 3		Effect of Netting		Total
	(In thousands)
Financial assets (liabilities):
Commodity derivatives:
Assets	$	3,225	$	10,964	$	(1,319)	$	12,870
Liabilities	(1,278)		(334)		1,319		(293)
	$	1,947	$	10,630	$	—	$	12,577

	December 31, 2017
	Level 2		Level 3		Effect of Netting		Total
	(In thousands)
Financial assets (liabilities):
Commodity derivatives:
Assets	$	2,137	$	3,344	$	(4,760)	$	721
Liabilities	(8,973)		(3,550)		4,760		(7,763)
	$	(6,836)	$	(206)	$	—	$	(7,042)

Reconciliations Of Level 3 Fair Value Measurements [Table Text Block]

The following tables are reconciliations of our level 3 fair value measurements: 

	Net Derivatives
	For the Year Ended,
	December 31, 2018		December 31, 2017
	(In thousands)
Beginning of period	$	(206)	$	(7,122)
Total gains or losses:
Included in earnings (1)	4,159		7,791
Settlements	6,677		(875)
End of period	$	10,630	$	(206)
Total gains for the period included in earnings attributable to the change in unrealized loss relating to assets still held at end of period	$	10,836	$	6,916

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1.Commodity derivatives are reported in the Consolidated Statements of Operations in gain (loss) on derivatives.

Schedule Of Quantitative Information About Unobservable Inputs [Table Text Block]

The following table provides quantitative information about our Level 3 unobservable inputs at December 31, 2018:

Commodity (1)	Fair Value	Valuation Technique	Unobservable Input	Range
	(In thousands)
Oil three-way collar	10,592	Discounted cash flow	Forward commodity price curve	$0.00 - $19.44
Natural gas collars	(334)	Discounted cash flow	Forward commodity price curve	$0.00 - $0.38
Natural gas three-way collar	372	Discounted cash flow	Forward commodity price curve	$0.00 - $0.43

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1.The commodity contracts detailed in this category include non-exchange-traded crude and natural gas three-way collars and natural gas collars that are valued based on NYMEX. The forward pricing range represents the low and high price expected to be received within the settlement period.