Oil and Gas Producing Activities

12 Months Ended

Dec. 31, 2016

Oil And Gas Exploration And Production Industries Disclosures [Abstract]

Oil and Gas Producing Activities

(3)  Oil and Gas Producing Activities

Set forth below is certain information regarding the aggregate capitalized costs of oil and gas properties and costs incurred by the Company for its oil and gas property acquisition, development and exploration activities:

Capitalized Costs

	As of December 31,
	2015			2016
	(In thousands)
Unproved properties	$	84,144		$	—
Proved properties:
Leasehold costs		982,915			662,022
Wells and related equipment and facilities		3,349,307			3,135,079
Accumulated depreciation depletion and amortization		(3,389,786	)		(3,009,236	)
	$	1,026,580		$	787,865

Costs Incurred

	For the Years Ended December 31,
	2014		2015		2016
	(In thousands)
Property Acquisitions:
Unproved property acquisitions	$	91,960	$	12,972	$	—
Proved property acquisitions		2,400		—		—
Development costs		440,848		221,265		58,587
Exploration costs		52,080		12,265		—
	$	587,288	$	246,502	$	58,587