| **Long-Term Debt Additional Information (Details) (USD $)**         | 0 Months Ended       | 3 Months Ended        | 0 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                         |                       | 0 Months Ended               | 3 Months Ended |                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 0 Months Ended        | 3 Months Ended |            | 6 Months Ended               | 12 Months Ended              |
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| **Debt Instrument**                                                 |                 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                  |           |       |                         |                         |   |   |   |   |   |   |
| Debt Instrument, Interest Rate, Stated Percentage                   |                 |                  | 3.25%                                                                                                                                                                                                                                                                                                                                                                                                                                                  |                  |                         | 7.75%          |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                  |           |       |                         |                         |   |   |   |   |   |   |
| Debt Instrument, Issuance Date                                      |                 | Nov. 15,         2010 |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  | Oct.        03,         2012 |           |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                  |           |       |                         |                         |   |   |   |   |   |   |
| Debt Instrument, Maturity Date                                      | May 15,         2016 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   | Oct. 15,         2022 |                         |           |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                  |           |       |                         |                         |   |   |   |   |   |   |
| Debt Instrument, Frequency of Periodic Payment                      |                 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                  |           |       |                         |                         |   |   | May 15 | April 15 | November 15 | October 15 |
| 3.25% Convertible Debt, Liability Component ($)                     |                 | $ 94,300,000          |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                  |           |       |                         |                         |   |   |   |   |   |   |
| Debt Instrument, Convertible, Effective Interest Rate               |                 |                  | 7.40%                                                                                                                                                                                                                                                                                                                                                                                                                                                  |                  |                         |           |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                  |           |       |                         |                         |   |   |   |   |   |   |
| Debt Instrument, Convertible, Terms of Conversion Feature           |                 |                  | Upon conversion, the convertible senior notes may be settled, at our election, in shares of our common stock, cash or a combination of cash and shares of our common stock. We have initially elected a net-settlement method to satisfy our conversion obligation, which allows us to settle the principal amount of the convertible notes in cash and to settle the excess conversion value in shares, as well as cash in lieu of fractional shares. |                  |                         |           |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                  |           |       |                         |                         |   |   |   |   |   |   |
| Line of Credit Facility, Initiation Date                            |                 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | Apr. 30,         2010 |           |       |                         | Nov.        05,         2010 |   |   |   |   |   |   |
| Line of Credit Facility, Maximum Borrowing Capacity ($)             |                 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           |                  | 400,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                  |           | 80,000,000 |                         |                         | 600,000,000 |   |   |   |   |   |
| Line of Credit Facility, Covenant Terms                             |                 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           |                  | At PDCM's discretion, interest accrues at either an alternative base rate ("ABR") or an adjusted LIBOR. The ABR is the greater of Wells Fargo's prime rate, the federal funds effective rate plus 0.5% or the adjusted LIBOR for a three month interest period plus 1%. ABR and adjusted LIBOR borrowings are assessed an additional margin based upon the outstanding balance as a percentage of the available balance. ABR borrowings are assessed an additional margin of 1.25% to 2.0%. Adjusted LIBOR borrowings are assessed an additional margin spread of 2.25% to 3.0%. |                  |           |       |                         |                         |   |   |   |   |   |   |
| Line of Credit Facility, Current Borrowing Capacity ($)             |                 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                  |           |       |                         |                         |   | 450,000,000 |   |   |   |   |
| Line of Credit Facility, Expiration Date                            |                 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           | Apr. 30,         2014 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                  |           |       | Nov.        05,         2015 |                         |   |   |   |   |   |   |
| Debt Instrument, Covenant Description                               |                 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           |                  | The credit facility contains covenants customary for agreements of this type, with the most restrictive being certain financial tests and financial ratios that must be met on a quarterly basis. The financial tests and ratios, as defined by the credit facility, include requirements to maintain a minimum current ratio of 1.0 to 1.0, not to exceed a debt to EBITDAX ratio of 4.5 to 1.0 (declining to 4.0 to 1.0 on September 30, 2013) and to maintain a minimum interest coverage ratio of 2.5 to 1.0                                                                 |                  |           |       |                         |                         | The revolving credit facility contains covenants customary for agreements of this type, with the most restrictive being certain financial tests and maintaining certain financial ratios on a quarterly basis. The financial tests and ratios, as defined per the revolving credit facility, include requirements to maintain a minimum current ratio of 1.00 to 1.00 and not exceed a maximum leverage ratio of 4.00 to 1.00. |   |   |   |   |   |
| Letters of Credit Outstanding, Amount ($)                           |                 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                  |           |       |                         |                         | 18,700,000 |   |   |   |   |   |
| Letter of Credit Fronting Fee                                       |                 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                  |           |       |                         |                         | 0.125% |   |   |   |   |   |
| Additional Quarterly Maintenance Fee                                |                 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                  |           |       |                         |                         | 2.00% |   |   |   |   |   |
| Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |                 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           |                  | 0.50%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  |           |       |                         |                         | 0.50% |   |   |   |   |   |
| Line of Credit Facility, Remaining Borrowing Capacity               |                 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                  |           |       |                         |                         | 374,300,000 |   |   |   |   |   |
| Debt, Weighted Average Interest Rate                                |                 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           |                  | 3.60%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |                  | 3.50%          |       |                         |                         |   |   |   |   |   |   |
| Proportionate Share of PDCM Credit Facility ($)                     |                 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                  |           | 40,000,000 |                         |                         |   |   |   |   |   |   |
| PDCM Line of Credit Outstanding ($)                                 |                 |                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                  |                         |           |                  | $ 28,750,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |                  | $ 26,250,000   |       |                         |                         |   |   |   |   |   |   |

| X                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The carrying amount of the liability component of 3.25% convertible debt which may be settled in cash upon conversion.
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No definition available.
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| - Definition
Additional quarterly maintenance fee equivalent to the spread over Eurodollar loans
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No definition available.
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| X                                                                                                                                                                                                                                                                                                |
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| - Definition
Letter of Credit Fronting Fee for the period the letter of credit remains outstanding.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                        |
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| - Definition
Amount borrowed by PDCM, a joint venture currently owned 50% by the Company, under their credit facility as of the balance sheet date.
+ References
No definition available.
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| - Definition
Proportionate share of the maximum borrowing capacity under PDCM's 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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| - Definition
The effective interest rate on the liability component of convertible debt instrument which may be settled in cash upon conversion, including partial cash settlement.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description of the conversion terms of a debt instrument which may include the conversion ratio (including all potential conversion ratios if contingently adjustable), type of debt or equity security into which the debt is convertible, the dollars of debt or the number of shares into which the instrument is convertible (or potentially convertible into), the conversion period, any contingencies associated with the conversion terms, and the existence and amount of a beneficial conversion feature.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description of the frequency of periodic payments (monthly, quarterly, annual).
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Interest rate stated in the contractual debt agreement.
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| - Definition
Date the debt instrument was issued, in CCYY-MM-DD format.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.
+ References
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| - Definition
Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.
+ References
No definition available.
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| - Definition
The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.
+ References
No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description of the conditions for borrowing under the credit facility including the nature of any restrictions.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
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| - Definition
Date the credit facility terminates, in CCYY-MM-DD format.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Date the credit facility first became available, in CCYY-MM-DD format.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 2: 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=d3e13212-122682Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5
+ Details**Name:**us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).
+ 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=d3e13212-122682Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5
+ Details**Name:**us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.
+ References
No definition available.
+ Details**Name:**us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |