Property And Equipment, Net (Tables)

9 Months Ended

Sep. 30, 2017

Property, Plant and Equipment [Abstract]

Schedule of Property and Equipment

As of September 30, 2017 and December 31, 2016, total property and equipment, net consisted of the following:

	September 30, 2017			December 31, 2016
	(In thousands)
Oil and gas properties, full cost method
Proved properties		$5,452,201			$4,687,416
Accumulated depreciation, depletion and amortization and impairments	(3,569,626		)	(3,392,749		)
Proved properties, net	1,882,575			1,294,667
Unproved properties, not being amortized
Unevaluated leasehold and seismic costs	697,370			211,067
Capitalized interest	42,835			29,894
Total unproved properties, not being amortized	740,205			240,961
Other property and equipment	25,344			23,127
Accumulated depreciation	(14,806		)	(12,995		)
Other property and equipment, net	10,538			10,132
Total property and equipment, net		$2,633,318			$1,545,760

Schedule of Impairment of Oil and Gas Properties

etails of the 12-Month Average Realized Price of crude oil for the three and nine months ended September 30,2017 and 2016 and the impairments of proved oil and gas properties for the three and nine months ended September 30,2016 are summarized in the table below: 

	Three Months Ended September 30,					Nine Months Ended September 30,
	2017			2016		2017			2016
Impairment of proved oil and gas properties (in thousands)		$—		$105,057			$—		$576,540
Crude Oil 12-Month Average Realized Price ($/Bbl) - Beginning of period	$46.80			$39.84		$39.60			$47.24
Crude Oil 12-Month Average Realized Price ($/Bbl) - End of period	$47.74			$38.36		$47.74			$38.36
Crude Oil 12-Month Average Realized Price percentage increase (decrease) during period	2		%	(4	%)	21		%	(19	%)