Contract Term

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- Definition

Cumulative Shortfall Accrued

+ References

No definition available.

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- Definition

Debt Instrument, Subjective Acceleration Clause, Period

+ References

No definition available.

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- Definition

Incentive plan payout percentages of target values based on performance above a minimum threshold

+ References

No definition available.

+ Details

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- Definition

Line Of Credit Facility, Target Borrowing Capacity

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Payments For (Proceeds From) Contract Settlement

+ References

No definition available.

+ Details

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- Definition

Shortfall Accrued

+ References

No definition available.

+ Details

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- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 3
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- Definition

Amount of the required periodic payments applied to interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of operating expense attributable to disposal group, including, but not limited to, discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721673-107760

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- Definition

Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

+ References

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20, 22
-Article 5

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Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Period expense related to postemployment benefits.

+ References

No definition available.

+ Details

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- Definition

The percentage rate used to calculate dividend payments on preferred stock.

+ References

No definition available.

+ Details

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- Definition

Energy measure of proved reserve of oil and gas, 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
-URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447

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- Definition

Energy measure of decrease in quantity of proved reserve of oil and gas resulting from production, 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 (e)
-URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447

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- Definition

The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

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Balance Type:	credit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Subsequent Events - Narrative (Details) $ in Thousands, shares in Millions				1 Months Ended				3 Months Ended	12 Months Ended
	Mar. 16, 2016 USD ($)	Mar. 15, 2016 USD ($)	Jan. 21, 2016 USD ($)	Feb. 29, 2016 USD ($)	Jan. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)	Aug. 31, 2015 USD ($)	Mar. 20, 2016 USD ($) shares	Dec. 31, 2015 USD ($) MMBoe shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Mar. 21, 2016 USD ($)	Mar. 11, 2016 USD ($)	Feb. 16, 2016	Jun. 09, 2015 USD ($)
Subsequent Event [Line Items]
Employee termination benefits									$ 12,451	$ 8,874	$ 122,505
Senior credit facility, borrowed amount									$ 0	0
Debt instrument, subjective acceleration clause, period									30 days
Cash paid, transfer of ownership of substantially all of oil and natural gas properties and midstream assets in Pinon and release from all past, current and future claims and obligations under existing agreement									$ 24,889	$ 0	$ 0
Common stock issued for debt (in shares) \| shares									92.8
Aggregate cash payments for accrued interest and early conversion of debt									$ 30,500
Treating Agreement
Subsequent Event [Line Items]
Contract agreement, term									30 years
Cumulative shortfall accrued									$ 109,900
Shortfall incurred in period									$ 34,900
Discontinued Operations, Disposed of by Means Other than Sale \| WTO Properties
Subsequent Event [Line Items]
Production, oil and natural gas (in MMBoe) \| MMBoe									1.9
Proved reserves, oil and natural gas (in MMBoe) \| MMBoe									24.6
Revenue									$ 14,600
Operating expenses									41,100
Senior credit facility
Subsequent Event [Line Items]
Line of credit facility, current borrowing capacity															$ 900,000
Senior Notes
Subsequent Event [Line Items]
Debt conversion, original debt, amount						$ 300,000	$ 275,000
Convertible Debt
Subsequent Event [Line Items]
Debt conversion, original debt, amount									255,300
June Amendment \| Senior credit facility
Subsequent Event [Line Items]
Line of credit facility, current borrowing capacity									$ 500,000
8.5% Convertible perpetual preferred stock
Subsequent Event [Line Items]
Preferred stock, dividend rate, percentage									8.50%	8.50%	8.50%
Subsequent Event
Subsequent Event [Line Items]
Employee termination benefits				$ 17,400
Senior credit facility, borrowed amount					$ 488,900
Common stock issued for debt (in shares) \| shares								84.4
Aggregate cash payments for accrued interest and early conversion of debt								$ 33,500
Subsequent Event \| Treating Agreement
Subsequent Event [Line Items]
Contract agreement, term			30 years
Subsequent Event \| Discontinued Operations, Disposed of by Means Other than Sale \| WTO Properties
Subsequent Event [Line Items]
Cash paid, transfer of ownership of substantially all of oil and natural gas properties and midstream assets in Pinon and release from all past, current and future claims and obligations under existing agreement			$ 11,000
Subsequent Event \| Performance Incentive Plan \| Minimum
Subsequent Event [Line Items]
Incentive plan, payout percentages of target values					0.00%
Subsequent Event \| Performance Incentive Plan \| Maximum
Subsequent Event [Line Items]
Incentive plan, payout percentages of target values					200.00%
Subsequent Event \| Senior Notes
Subsequent Event [Line Items]
Interest payments		$ 22,000
Subsequent Event \| June Amendment \| Senior credit facility
Subsequent Event [Line Items]
Line of credit facility, current borrowing capacity													$ 340,000
Line of credit facility, target borrowing capacity												$ 500,000
Subsequent Event \| 8.5% Convertible perpetual preferred stock
Subsequent Event [Line Items]
Preferred stock, dividend rate, percentage					8.50%
7.5% Senior Notes due 2023 \| Senior Notes
Subsequent Event [Line Items]
Long-term debt, fixed interest rate						7.50%	7.50%		7.50%	7.50%
Debt conversion, original debt, amount						$ 30,600	$ 116,600
7.5% Senior Notes due 2023 \| Subsequent Event \| Senior Notes
Subsequent Event [Line Items]
Long-term debt, fixed interest rate														7.50%
7.5% Senior Notes due 2021 \| Senior Notes
Subsequent Event [Line Items]
Long-term debt, fixed interest rate						7.50%	7.50%		7.50%	7.50%
Debt conversion, original debt, amount						$ 189,300	$ 40,700
7.5% Senior Notes due 2021 \| Subsequent Event \| Senior Notes
Subsequent Event [Line Items]
Interest payments	$ 28,400
8.125% Convertible Senior Notes due 2022
Subsequent Event [Line Items]
Long-term debt, fixed interest rate									8.125%
8.125% Convertible Senior Notes due 2022 \| Convertible Debt
Subsequent Event [Line Items]
Long-term debt, fixed interest rate						8.125%	8.125%		8.125%	8.125%
Debt conversion, original debt, amount									$ 186,600
8.125% Convertible Senior Notes due 2022 \| Subsequent Event \| Convertible Debt
Subsequent Event [Line Items]
Debt conversion, original debt, amount								200,500
7.5% Convertible Senior Notes due 2023
Subsequent Event [Line Items]
Long-term debt, fixed interest rate									7.50%
7.5% Convertible Senior Notes due 2023 \| Convertible Debt
Subsequent Event [Line Items]
Long-term debt, fixed interest rate						7.50%	7.50%		7.50%	7.50%
Debt conversion, original debt, amount									$ 68,700
7.5% Convertible Senior Notes due 2023 \| Subsequent Event \| Convertible Debt
Subsequent Event [Line Items]
Debt conversion, original debt, amount								$ 31,600