Accrued and unpaid interest for the last interest payment date to the redemption date

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Accrued and unpaid interest from the last interest payment date up to, but not including the settlement date of the tender offer

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No definition available.

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The percentage to be added to the adjusted LIBO rate in determining the base interest rate.

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Current ratio

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The cash consideration paid as part of the tender offer.

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The cash outflow associated with the redemption of senior debt, which also includes the premium paid to redeem the senior debt

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Price per note of original principal amount of debt at which debt can be redeemed by the issuer.

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The future cash outflows required associated with business acquisitions and mergers.

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The percentage to be added to the Federal Funds Effective Rate in determining the base interest rate.

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Represents the threshold of the pre-tax SEC PV-10 reserve value that if exceeded, a mortgage lien on the oil and natural gas property exists as collateral for borrowings under the Senior Secured Revolving Credit Facility.

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Principal amount per note under the terms of the Convertible Senior Notes

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Ratio of Total Debt to EBITDA

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No definition available.

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The tender offer consideration rate per terms of the Tender Offer, which represents the amount tendered per $1,000 principal amount note

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No definition available.

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Write-off of amounts previously capitalized as debt issuance cost and unamortized discount in an extinguishment of debt.

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No definition available.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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-Name Accounting Standards Codification

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-Subparagraph (SX 210.5-02.22)

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-Number 210

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-Paragraph 16

-Article 9

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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No definition available.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

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Face (par) amount of the original debt instrument that was repurchased.

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No definition available.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Weighted average interest rate of debt outstanding.

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No definition available.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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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.

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-Name Regulation S-X (SX)

-Number 210

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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.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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No definition available.

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The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share.

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No definition available.

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Debt (Narrative) (Details)		1 Months Ended	3 Months Ended		6 Months Ended
Debt (Narrative) (Details)	Apr. 28, 2015 USD ($)	May. 14, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Rate	Jun. 30, 2014 USD ($)	May. 05, 2015 USD ($)	Apr. 14, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 10, 2012	Nov. 02, 2010
Debt Instrument [Line Items]
Loss on extinguishment of debt			$ (38,137,000)	$ 0	$ (38,137,000)	$ 0
Deferred Purchase Payment [Member]
Debt Instrument [Line Items]
Deferred purchase payment			0		0				$ 150,000,000
Debt Instrument, Unamortized Discount			0		0				1,100,000
Senior Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity			$ 685,000,000		685,000,000		$ 685,000,000
Ratio of total debt to EBITDA			2.61
Current ratio			2.75
Line of credit facility amount outstanding			$ 117,000,000		$ 117,000,000				0
Debt, Weighted Average Interest Rate			1.67%		1.67%
Letters of credit outstanding amount			$ 560,000		$ 560,000
Pre-Tax SEC PV10 Reserve Value Percentage \| Rate					80.00%
Federal funds rate plus percentage			0.50%		0.50%
Adjusted LIBO rate plus percentage			1.00%		1.00%
Senior Secured Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Ratio of total debt to EBITDA			4.00
Senior Secured Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Current ratio			1.00
Swing Line Sublimit [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							$ 15,000,000
8.625% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage											8.625%
Debt Instrument, Redemption, Cash Consideration		$ 352,600,000
Loss on extinguishment of debt					$ 38,100,000
Write off of Deferred Debt Issuance Cost and Unamortized Discount					11,400,000
Accrued interest paid associated with redemption of debt		2,300,000
Redemption Premium	$ 12,200,000	$ 14,500,000			26,700,000
Accrued interest paid associated with tender offer	822,879
Debt Instrument, Redemption Price, Percentage		104.313%
Debt Instrument, Redemption Price per Note		$ 1,043.13
Long term debt			$ 0		0			$ 600,000,000	600,000,000
Debt Instrument, Unamortized Discount			$ 0		0				3,444,000
Debt Instrument, Cash Consideration for Tender Offer	276,400,000
Debt Instrument, Repurchased Face Amount	264,200,000	335,800,000
Tender Offer Consideration Rate	$ 1,046.13
Principal amount per note		$ 1,000
8.625% Senior Notes [Member] \| Minimum [Member] \| On and after October 15, 2014 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage			100.00%
6.25% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.25%
Proceeds from Issuance of Debt	$ 640,300,000
Debt Instrument, Face Amount	$ 650,000,000
Long term debt			$ 650,000,000		650,000,000				0
6.25% Senior Notes [Member] \| Prior to April 15, 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage			100.00%
6.25% Senior Notes [Member] \| Maximum [Member] \| On and after April 15, 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage			104.688%
6.25% Senior Notes [Member] \| Minimum [Member] \| On and after April 15, 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage			100.00%
Seven Point Five Percent Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage										7.50%
Long term debt			$ 600,000,000		$ 600,000,000				$ 600,000,000