Costs Incurred for Property Acquisition, Exploration and Development

3 Months Ended

Mar. 31, 2018

Extractive Industries [Abstract]

Costs Incurred for Property Acquisition, Exploration and Development

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

	Three Months Ended March 31, 2018		Year Ended December 31, 2017
	(in thousands)
Acquisitions:
Acreage purchases	$	19,705	$	62,075
Oil and gas properties		—		18,269
Development		225,033		1,177,526
Exploration:
Drilling		1,855		2,030
Expense		6,968		50,920
Stock-based compensation expense		751		2,742
Gas gathering facilities:
Development		8,590		15,097
Subtotal		262,902		1,328,659
Asset retirement obligations		5,063		20,245
Total costs incurred	$	267,965	$	1,348,904

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