Property and Equipment

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and Equipment

The following table summarizes our property and equipment as of the dates presented: 

	December 31,
	2017			2016
Oil and gas properties:
Proved	$	460,029		$	251,083
Unproved	117,634			4,719
Total oil and gas properties	577,663			255,802
Other property and equipment	12,712			3,575
Total property and equipment	590,375			259,377
Accumulated depreciation, depletion and amortization	(61,316		)	(11,904		)
	$	529,059		$	247,473

Unproved property costs of $117.6 million and $4.7 million have been excluded from amortization as of December 31, 2017 and December 31, 2016, respectively. We transferred $40.4 million and $3.8 million of undeveloped leasehold costs, including capitalized interest, associated with proved undeveloped reserves, acreage unlikely to be drilled or expiring acreage, from unproved properties to the full cost pool during the year ended December 31, 2017 and Successor period ended December 31, 2016. We capitalized internal costs of $2.4 million and $0.5 million and interest of $2.7 million and less than $0.1 million during the year ended December 31, 2017 and the Successor period ended December 31, 2016, respectively, in accordance with our accounting policies. Average DD&A per barrel of oil equivalent of proved oil and gas properties was $12.87 for the year ended December 31, 2017, $11.21 for the Successor period from September 13, 2016 through December 31, 2016, $10.04 for the Predecessor period from January 1, 2016 through September 12, 2016 and $42.22 for the year ended December 31, 2015. The DD&A rate for the Predecessor periods was determined under the successful efforts method while the Successor periods subsequent to September 12, 2016 were determined under the full cost method (see Note 2).