Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2015

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, 2015 and 2014 (in thousands).

	December 31,
	2015			2014
Oil and natural gas properties
Evaluated (subject to amortization)	$	2,122,174		$	1,617,913
Unproved and unevaluated (not subject to amortization)	387,504			264,419
Total oil and natural gas properties	2,509,678			1,882,332
Accumulated depletion	(1,574,040		)	(596,218		)
Net oil and natural gas properties	935,638			1,286,114
Other property and equipment
Midstream support equipment and facilities	78,564			38,135
Furniture, fixtures and other equipment	2,918			2,633
Software	2,193			1,733
Land	1,539			—
Leasehold improvements	1,173			971
Total other property and equipment	86,387			43,472
Accumulated depreciation	(9,619		)	(7,514		)
Net other property and equipment	76,768			35,958
Net property and equipment	$	1,012,406		$	1,322,072

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, 2015 and the year in which these costs were incurred (in thousands).

Description	2015		2014		2013		2012 and prior		Total
Costs incurred for
Property acquisition	$	238,436	$	68,207	$	41,800	$	672	$	349,115
Exploration wells	14,650		30		—		—		14,680
Development wells	22,558		1,151		—		—		23,709
Total	$	275,644	$	69,388	$	41,800	$	672	$	387,504