Fair Value Measurements of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table presents the derivative assets and liabilities that are measured at fair value on a recurring basis at December 31, 2016 and December 31, 2015 for each of the fair value hierarchy levels:

	Fair Value Measurements at December 31, 2016 Using
	Quoted Prices in		Significant Other		Significant
	Active Market		Observable Inputs		Unobservable Inputs
	(Level 1)		(Level 2)		(Level 3)		Fair Value
	(In thousands)
Assets:
Commodity derivatives	$	—	$	189,851	$	—	$	189,851
Total assets	$	—	$	189,851	$	—	$	189,851
Liabilities:
Commodity derivatives	$	—	$	17,757	$	—	$	17,757
Total liabilities	$	—	$	17,757	$	—	$	17,757

	Fair Value Measurements at December 31, 2015 Using
	Quoted Prices in		Significant Other		Significant
	Active Market		Observable Inputs		Unobservable Inputs
	(Level 1)		(Level 2)		(Level 3)		Fair Value
	(In thousands)
Assets:
Commodity derivatives	$	—	$	816,995	$	—	$	816,995
Interest rate derivatives		—		—		—		—
Total assets	$	—	$	816,995	$	—	$	816,995
Liabilities:
Commodity derivatives	$	—	$	84,501	$	—	$	84,501
Interest rate derivatives		—		2,655		—		2,655
Total liabilities	$	—	$	87,156	$	—	$	87,156