Annual discount rate for discounting future cash flows.

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- Definition

The calculated weighted average natural gas price per mcf utilized for purposes of estimating the company's proved reserves and future net revenue.

+ References

No definition available.

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- Definition

The calculated weighted average natural gas liquids price per barrel utilized for purposes of estimating the company's proved reserves and future net revenue.

+ References

No definition available.

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- Definition

The calculated weighted average oil price per barrel utilized for purposes of estimating the company's proved reserves and future net revenue.

+ References

No definition available.

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- Definition

The amount the impairment of oil and gas properties was decreased as a result of hedges in place for oil and gas producing companies subject to full cost accounting.

+ References

No definition available.

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- Definition

Increase In Impairment Of Oil And Gas Properties

+ References

No definition available.

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- Definition

Interest costs capitalized on unevaluated properties.

+ References

No definition available.

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- Definition

Percentage of Proved Oil and Natural Gas Reserves

+ References

No definition available.

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- Definition

The period of time in which unproved oil and gas properties/projects are expected to be evaluated and included in the amortization base for oil and gas properties.

+ References

No definition available.

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- Definition

The number of unproved oil and gas properties/projects associated with capitalized costs excluded from amortization.

+ References

No definition available.

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- Definition

The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section 35
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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- Definition

Energy measure of increase in quantity of proved reserve of oil and gas resulting from the extension of the proved acreage of previously discovered reservoir or discovery of new field with proved reserve or of new reservoir of proved reserve in old field, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447

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Energy measure of increase (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447

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- Definition

Energy measure of decrease in quantity of proved reserve of oil and gas resulting from sale of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447

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- Definition

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.

+ References

No definition available.

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SUPPLEMENTAL INFORMATION ON OIL AND NATURAL GAS OPERATIONS - UNAUDITED - Additional Information (Details) $ in Thousands											3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($) project $ / bbl $ / Mcf	Sep. 30, 2016 USD ($) $ / bbl $ / Mcf	Jun. 30, 2016 USD ($) $ / bbl $ / Mcf	Mar. 31, 2016 USD ($) $ / bbl $ / Mcf	Dec. 31, 2015 USD ($) $ / bbl $ / Mcf	Sep. 30, 2015 USD ($) $ / bbl $ / Mcf	Jun. 30, 2015 USD ($) $ / bbl $ / Mcf	Mar. 31, 2015 USD ($) $ / bbl $ / Bngl $ / Mcf	Dec. 31, 2014 USD ($) $ / bbl $ / Mcf	Sep. 30, 2014 USD ($) $ / bbl $ / Mcf	Dec. 31, 2016 USD ($) project $ / bbl $ / Mcf	Sep. 30, 2016 USD ($) $ / bbl $ / Mcf	Jun. 30, 2016 USD ($) $ / bbl $ / Mcf	Mar. 31, 2016 USD ($) $ / bbl $ / Mcf	Dec. 31, 2015 USD ($) $ / bbl $ / Mcf	Sep. 30, 2015 USD ($) $ / bbl $ / Mcf	Jun. 30, 2015 USD ($) $ / bbl $ / Mcf	Mar. 31, 2015 USD ($) $ / bbl $ / Bngl $ / Mcf	Dec. 31, 2016 USD ($) Bcfe project $ / bbl $ / Mcf	Dec. 31, 2015 USD ($) Bcfe $ / bbl $ / Mcf	Dec. 31, 2014 USD ($) Bcfe $ / bbl $ / Mcf
Reserve Quantities [Line Items]
Write-down of oil and gas properties											$ 73,094	$ 36,484	$ 118,649	$ 129,204	$ 351,062	$ 295,679	$ 224,294	$ 491,412	$ 357,431	$ 1,362,447	$ 351,192
Average 12-month oil prices net of differentials \| $ / bbl	40.15	40.51	43.49	46.72	51.16	57.76	68.68	78.99	89.46	94.94	40.15	40.51	43.49	46.72	51.16	57.76	68.68	78.99	40.15	51.16	89.46
Average 12-month gas prices net of differentials \| $ / Mcf	1.71	1.99	1.93	2.01	2.19	2.44	2.47	2.96	3.68	4.19	1.71	1.99	1.93	2.01	2.19	2.44	2.47	2.96	1.71	2.19	3.68
Increase in written down value of oil and gas properties									$ 13,342	$ 29,001
Specifically identified drilling projects \| project	73										73								73
Projects expected to be evaluated																			4 years
Interest costs capitalized on unevaluated properties																			$ 26,634	$ 41,339	$ 45,722
Annual discount rate for discounting future cash flows																			10.00%
Percentage proved oil and natural gas reserves																			34.00%
Scenario, Adjustment
Reserve Quantities [Line Items]
Revisions of previous estimates \| Bcfe																			92	(570)
CANADA
Reserve Quantities [Line Items]
Write-down of oil and gas properties																			$ 352	$ 47,630	$ 0
Well Performance \| Scenario, Adjustment
Reserve Quantities [Line Items]
Revisions of previous estimates \| Bcfe																			(35)	42
Appalachia Drilling Program
Reserve Quantities [Line Items]
Extensions, discoveries and other additions \| Bcfe																					118
Sale of reserves primarily related to sale \| Bcfe																					15
Deep Water Drilling Program
Reserve Quantities [Line Items]
Extensions, discoveries and other additions \| Bcfe																					116
GOM Conventional Shelf Properties
Reserve Quantities [Line Items]
Sale of reserves primarily related to sale \| Bcfe																					63
Gold of Mexico Basin
Reserve Quantities [Line Items]
Percentage proved oil and natural gas reserves																			66.00%
NGLs (MBbls)
Reserve Quantities [Line Items]
Average 12-month gas prices net of differentials		13.88	9.33	13.65	16.40	23.04	29.13	28.82	36.79	41.33		13.88	9.33	13.65	16.40	23.04	29.13	28.82		16.40	36.79
Average 12-month natural gas liquids prices net of differentials \| $ / bbl	9.46				16.40				36.79		9.46				16.40				9.46	16.40	36.79
Decrease in written down value of oil and gas properties		$ 9,636	$ 18,112	$ 22,986	$ 24,797	$ 42,652	$ 47,784	$ 28,687
Increase in written down value of oil and gas properties	$ 0
Oil And Gas
Reserve Quantities [Line Items]
Write-down of oil and gas properties	$ 73,094	$ 36,484	$ 118,649	128,852	$ 348,601	$ 295,679	$ 179,125	$ 491,412	$ 304,062	$ 47,130
Oil And Gas \| CANADA
Reserve Quantities [Line Items]
Write-down of oil and gas properties				$ 352