Property and Equipment

6 Months Ended

Jun. 30, 2018

Property, Plant and Equipment [Abstract]

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



	June 30,			December 31,
	2018			2017
Oil and gas properties:
Proved	$	756,863		$	460,029
Unproved	134,943			117,634
Total oil and gas properties	891,806			577,663
Other property and equipment	16,105			12,712
Total properties and equipment	907,911			590,375
Accumulated depreciation, depletion and amortization	(116,287		)	(61,316		)
	$	791,624		$	529,059

Unproved property costs of $134.9 million and $117.6 million have been excluded from amortization as of June 30, 2018 and December 31, 2017, respectively. We transferred $5.6 million of undeveloped leasehold costs associated with acreage unlikely to be drilled or associated with proved undeveloped reserves, including capitalized interest, from unproved properties to the full cost pool during the six months ended June 30, 2018. We capitalized internal costs of $1.6 million and $1.1 million and interest of $4.7 million and less than $0.1 million during the six months ended June 30, 2018 and 2017, respectively, in accordance with our accounting policies. Average depreciation, depletion and amortization (“DD&A”) per barrel of oil equivalent of proved oil and gas properties was $15.36 and $11.74 for the six months ended June 30, 2018 and 2017, respectively.