Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Hierarchy of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following tables set forth by level within the fair value hierarchy the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis:

	Fair value at December 31, 2018
	Level 1		Level 2		Level 3		Total
	(In thousands)
Assets:
Money market funds	$	143	$	—	$	—	$	143
Commodity derivative instruments (see Note 8)	—		106,875		—		106,875
Total assets	$	143	$	106,875	$	—	$	107,018
Liabilities:
Commodity derivative instruments (see Note 8)	$	—	$	104	$	—	$	104
Total liabilities	$	—	$	104	$	—	$	104
	Fair value at December 31, 2017
	Level 1		Level 2		Level 3		Total
	(In thousands)
Assets:
Money market funds	$	142	$	—	$	—	$	142
Commodity derivative instruments (see Note 8)	—		353		—		353
Total assets	$	142	$	353	$	—	$	495
Liabilities:
Commodity derivative instruments (see Note 8)	$	—	$	135,567	$	—	$	135,567
Total liabilities	$	—	$	135,567	$	—	$	135,567