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

9 Months Ended

Sep. 30, 2021

Extractive Industries [Abstract]

Costs Incurred for Property Acquisition, Exploration and Development

	Nine Months Ended September 30, 2021		Year Ended December 31, 2020
	(in thousands)
Acquisitions:
Acreage purchases	$	14,014	$	26,166
Development		298,300		369,093
Exploration:
Drilling		6,299		7,709
Expense		15,331		31,376
Stock-based compensation expense		1,116		1,279
Gas gathering facilities:
Development		2,846		3,694
Subtotal		337,906		439,317
Asset retirement obligations		2,879		2,610
Total costs incurred	$	340,785	$	441,927

(a) Includes costs incurred whether capitalized or expensed.