Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (Tables)

9 Months Ended

Sep. 30, 2020

Extractive Industries [Abstract]

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization

	September 30, 2020			December 31, 2019
	(in thousands)
Natural gas properties:
Properties subject to depletion	$	8,784,788		$	9,345,557
Unproved properties		862,113			868,180
Total		9,646,901			10,213,737
Accumulated depletion and depreciation		(3,975,930	)		(4,172,702	)
Net capitalized costs	$	5,670,971		$	6,041,035

^{(a) Includes capitalized asset retirement costs and the associated accumulated amortization.}