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

9 Months Ended

Sep. 30, 2016

Extractive Industries [Abstract]

Costs Incurred for Property Acquisition, Exploration and Development

	Nine Months Ended September 30, 2016		Year Ended December 31, 2015
	(in thousands)
Acquisitions:
Acreage purchases	$	16,282	$	73,025
Oil and gas properties		3,086,635		—
Asset retirement obligations		16,609		—
Development		302,518		708,268
Exploration:
Drilling		37,528		87,505
Expense		16,972		18,421
Stock-based compensation expense		1,669		2,985
Gas gathering facilities:
Development		1,345		13,337
Subtotal		3,479,558		903,541
Asset retirement obligations		4,655		22,184
Total costs incurred	$	3,484,213	$	925,725

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