Property And Equipment, Net

6 Months Ended

Jun. 30, 2018

Property, Plant and Equipment [Abstract]

4. Property and Equipment, Net

As of June 30, 2018 and December 31, 2017, total property and equipment, net consisted of the following:



	June 30, 2018			December 31, 2017
	(In thousands)
Oil and gas properties, full cost method
Proved properties		$5,744,434			$5,615,153
Accumulated depreciation, depletion and amortization and impairments	(3,784,483		)	(3,649,806		)
Proved properties, net	1,959,951			1,965,347
Unproved properties, not being amortized
Unevaluated leasehold and seismic costs	539,836			612,589
Capitalized interest	58,056			47,698
Total unproved properties, not being amortized	597,892			660,287
Other property and equipment	27,223			25,625
Accumulated depreciation	(16,641		)	(15,449		)
Other property and equipment, net	10,582			10,176
Total property and equipment, net		$2,568,425			$2,635,810

Average depreciation, depletion and amortization (“DD&A”) per Boe of proved properties was $13.74 and $12.43 for the three months ended June 30, 2018 and 2017, respectively, and $13.73 and $12.55 for the six months ended June 30, 2018 and 2017, respectively.

The Company capitalized internal costs of employee compensation and benefits, including stock-based compensation, directly associated with acquisition, exploration and development activities totaling $6.1 million and $1.9 million for the three months ended June 30, 2018 and 2017, respectively, and $12.7 million and $7.3 million for the six months ended June 30, 2018 and 2017, respectively.

Unproved properties, not being amortized, include unevaluated leasehold and seismic costs associated with specific unevaluated properties and related capitalized interest. The Company capitalized interest costs associated with its unproved properties totaling $8.7 million and $4.0 million for the three months ended June 30, 2018 and 2017, respectively, and $19.1 million and $7.8 million for the six months ended June 30, 2018 and 2017, respectively.