Oil and Gas Properties (Tables)

12 Months Ended

Dec. 31, 2016

Extractive Industries [Abstract]

Summary of Oil and Gas Properties

A summary of oil and gas properties follows:

	December 31, 2016			December 31, 2015
	(In thousands)
Proved properties and equipment	$	538,695		$	584,692
Unproved properties		72,584			70,298
Less accumulated depreciation, depletion, amortization, and impairment		(172,051	)		(166,890	)
	$	439,228		$	488,100