Property and Equipment

9 Months Ended

Sep. 30, 2018

Property, Plant and Equipment [Abstract]

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



	September 30,			December 31,
	2018			2017
Oil and gas properties:
Proved	$	864,426		$	460,029
Unproved	132,576			117,634
Total oil and gas properties	997,002			577,663
Other property and equipment	18,701			12,712
Total properties and equipment	1,015,703			590,375
Accumulated depreciation, depletion and amortization	(156,937		)	(61,316		)
	$	858,766		$	529,059

Unproved property costs of $132.6 million and $117.6 million have been excluded from amortization as of September 30, 2018 and December 31, 2017, respectively. An additional $18.7 million of costs, associated with wells in-progress for which we had not previously recognized any proved undeveloped reserves, were excluded from amortization as of September 30, 2018. We transferred $11.4 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 nine months ended September 30, 2018. We capitalized internal costs of $2.4 million and $1.6 million and interest of $7.1 million and $0.1 million during the nine months ended September 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 $15.83 and $11.93 for the nine months ended September 30, 2018 and 2017, respectively.