Costs Incurred for Property Acquisition, Exploration and Development

6 Months Ended

Jun. 30, 2017

Extractive Industries [Abstract]

Costs Incurred for Property Acquisition, Exploration and Development

(19) Costs Incurred for Property Acquisition, Exploration and Development ^(a)

	Six Months Ended June 30, 2017		Year Ended December 31, 2016
	(in thousands)
Acquisitions:
Acreage purchases	$	34,015	$	33,142
Oil and gas properties		6,875		3,098,772
Asset retirement obligations		—		21,908
Development		505,739		497,795
Exploration:
Drilling		706		37,680
Expense		21,968		30,027
Stock-based compensation expense		1,035		2,298
Gas gathering facilities:
Development		2,839		3,595
Subtotal		573,177		3,725,217
Asset retirement obligations		3,855		(24,064	)
Total costs incurred	$	577,032	$	3,701,153

^(a) Includes costs incurred whether capitalized or expensed.