Business Combination, Acres Acquired In Leasehold Position

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Oil and Gas Producing Activities, Expected Period to Evaluate Existing Unevaluated Properties

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Percentage of Unevaluated Costs Capitalized in Period

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Unevaluated Costs Expected to be Evaluated Within Next Twelve Months

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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-Publisher FASB
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-Topic 805
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The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs.

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Amount of interest capitalized during the period.

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The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of wells in the process of being drilled in each geographic area as of the date listed.

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Supplementary Information on Oil and Gas Operations-Unaudited - Investment in Oil and Gas Properties (Details) a in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Wells	Dec. 31, 2015 USD ($) a Wells	Dec. 31, 2014 USD ($)
Reserve Quantities [Line Items]
Sale of oil and gas properties	$ 25,482	$ 271,769	$ 11,908
Unevaluated oil and gas properties	9,000	12,500
Interest costs capitalized	$ 900	4,700	10,000
Expected period to evaluate existing unevaluated properties	3 years
Unevaluated costs expected to be evaluated in 2017	$ 1,800
Fort Trinidad
Reserve Quantities [Line Items]
Sale of oil and gas properties		500
East Haynesville
Reserve Quantities [Line Items]
Sale of oil and gas properties		100
Eagle Ford
Reserve Quantities [Line Items]
Sale of oil and gas properties			9,800
Uncompleted Wells Equipment and Facilities
Reserve Quantities [Line Items]
Unevaluated oil and gas properties	$ 400	$ 200
Exploratory wells drilled, unevaluated \| Wells	1	2
2012
Reserve Quantities [Line Items]
Unevaluated oil and gas properties	$ 3,400
Percentage of unevaluated costs capitalized in period	38.00%
2011
Reserve Quantities [Line Items]
Unevaluated oil and gas properties		$ 1,100
Percentage of unevaluated costs capitalized in period		12.00%
Prior to 2011
Reserve Quantities [Line Items]
Unevaluated oil and gas properties			$ 4,500
Percentage of unevaluated costs capitalized in period			50.00%
Louisiana \| Fleetwood Joint Venture
Reserve Quantities [Line Items]
Aggregate purchase price		$ 24,000
Number of acres acquired \| a		30
Woodford And Mississippian Lime
Reserve Quantities [Line Items]
Sale of oil and gas properties	$ 274,100
Oklahoma Assets
Reserve Quantities [Line Items]
Sale of oil and gas properties	$ 17,600