Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Summary of the Company's property and equipment

The following table presents a summary of the Company’s property and equipment balances as of December 31, 2018 and 2017 (in thousands).

	December 31,
	2018			2017
Oil and natural gas properties
Evaluated (subject to amortization)	$	3,780,236		$	3,004,770
Unproved and unevaluated (not subject to amortization)	1,199,511			637,396
Total oil and natural gas properties	4,979,747			3,642,166
Accumulated depletion	(2,273,010		)	(2,021,169		)
Net oil and natural gas properties	2,706,737			1,620,997
Midstream and other property and equipment
Midstream equipment and facilities	424,480			258,725
Furniture, fixtures and other equipment	7,184			6,109
Software	8,039			7,942
Land	4,192			2,892
Leasehold improvements	6,171			5,428
Total midstream and other property and equipment	450,066			281,096
Accumulated depreciation	(33,939		)	(20,637		)
Net midstream and other property and equipment	416,127			260,459
Net property and equipment	$	3,122,864		$	1,881,456

Breakdown of the Company's unproved and unevaluated property costs not subject to amortization

The following table provides a breakdown of the Company’s unproved and unevaluated property costs not subject to amortization as of December 31, 2018 and the year in which these costs were incurred (in thousands).

Description	2018		2017		2016		2015 and prior		Total
Costs incurred for
Property acquisition	$	602,117	$	212,846	$	116,389	$	223,656	$	1,155,008
Exploration wells	12,361		1,235		712		204		14,512
Development wells	29,399		391		159		42		29,991
Total	$	643,877	$	214,472	$	117,260	$	223,902	$	1,199,511