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Costs Incurred for Property Acquisition, Exploration and Development

6 Months Ended

Jun. 30, 2019

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

	Six Months Ended June 30, 2019		Year Ended December 31, 2018
	(in thousands)
Acquisitions:
Acreage purchases	$	22,577	$	62,390
Oil and gas properties		—		1,683
Development		392,972		834,552
Exploration:
Drilling		—		1,380
Expense		15,444		32,196
Stock-based compensation expense		876		1,921
Gas gathering facilities:
Development		2,085		10,218
Subtotal		433,954		944,340
Asset retirement obligations		2,326		28,826
Total costs incurred	$	436,280	$	973,166

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