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

6 Months Ended

Jun. 30, 2020

Extractive Industries [Abstract]

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization

	June 30, 2020			December 31, 2019
	(in thousands)
Natural gas properties:
Properties subject to depletion	$	9,498,785		$	9,345,557
Unproved properties		864,634			868,180
Total		10,363,419			10,213,737
Accumulated depletion and depreciation		(4,369,793	)		(4,172,702	)
Net capitalized costs	$	5,993,626		$	6,041,035

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