Costs Incurred for Property Acquisition, Exploration and Development (Tables)

9 Months Ended

Sep. 30, 2019

Extractive Industries [Abstract]

Costs Incurred for Property Acquisition, Exploration and Development

	Nine Months Ended September 30, 2019		Year Ended December 31, 2018
	(in thousands)
Acquisitions:
Acreage purchases	$	31,582	$	62,390
Oil and gas properties		—		1,683
Development		541,455		834,552
Exploration:
Drilling		—		1,380
Expense		25,961		32,196
Stock-based compensation expense		1,372		1,921
Gas gathering facilities:
Development		3,127		10,218
Subtotal		603,497		944,340
Asset retirement obligations		812		28,826
Total costs incurred	$	604,309	$	973,166

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