Costs Incurred for Property Acquisition, Exploration and Development

9 Months Ended

Sep. 30, 2018

Extractive Industries [Abstract]

Costs Incurred for Property Acquisition, Exploration and Development

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

	Nine Months Ended September 30, 2018		Year Ended December 31, 2017
	(in thousands)
Acquisitions:
Acreage purchases	$	40,811	$	62,075
Oil and gas properties		1,683		18,269
Development		676,896		1,177,526
Exploration:
Drilling		805		2,030
Expense		21,990		50,920
Stock-based compensation expense		1,527		2,742
Gas gathering facilities:
Development		6,076		15,097
Subtotal		749,788		1,328,659
Asset retirement obligations		20,452		20,245
Total costs incurred	$	770,240	$	1,348,904

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