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

6 Months Ended

Jun. 30, 2014

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization

	June 30, 2014			December 31, 2013
	(in thousands)
Natural gas and oil properties:
Properties subject to depletion	$	8,843,288		$	8,225,859
Unproved properties		888,722			807,022
Total		9,732,010			9,032,881
Accumulated depreciation, depletion and amortization		(2,336,666	)		(2,274,444	)
Net capitalized costs	$	7,395,344		$	6,758,437

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