Deferred Revenue from Volumetric Production Payment (Tables)

12 Months Ended

Dec. 31, 2014

Deferred Revenue Disclosure [Abstract]

Schedule of changes in deferred revenue from the VPP

The following table reflects the changes in deferred revenue during the years ended December 31, 2014 and December 31, 2013:

	2014			2013
	(In thousands)
Beginning of period	$	29,770		$	37,184
Deferred revenue from VPP	1,067			1,332
Amortization of deferred revenue from VPP	(7,708		)	(8,746		)
End of period	$	23,129		$	29,770