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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $) In Thousands | Jun. 30, 2011 | Jun. 30, 2010 | Mar. 31, 2010
--- | --- | --- | ---
Assets | $ 2,900 |  | $ 62,500 | $ 28,200
Total net liability | 1,314,591 | [1] |  |
Long-term debt, Fair Value | 1,304,590 |  |  |
Long-term debt, Carrying Value | 1,261,766 |  |  |
Interest Rate Swap [Member] |  |  |  |
Liabilities | 1,157 | [1] |  |
Interest Rate Swap [Member] | Level 1[Member] |  |  |  |
Liabilities | 0 | [1] |  |
Interest Rate Swap [Member] | Level 2 [Member] |  |  |  |
Liabilities | 1,157 | [1],[2] |  |
Interest Rate Swap [Member] | Level 3 [Member] |  |  |  |
Liabilities | 0 | [1] |  |
Oil and Gas Swaps and Collars [Member] |  |  |  |
Assets | 7,531 | [1] |  |
Liabilities | 16,680 | [1] |  |
Oil and Gas Swaps and Collars [Member] | Level 1[Member] |  |  |  |
Assets | 0 | [1] |  |
Liabilities | 0 | [1] |  |
Oil and Gas Swaps and Collars [Member] | Level 2 [Member] |  |  |  |
Assets | 7,531 | [1],[2] |  |
Liabilities | 16,680 | [1],[2] |  |
Oil and Gas Swaps and Collars [Member] | Level 3 [Member] |  |  |  |
Assets | 0 | [1] |  |
Liabilities | 0 | [1] |  |
Foreign Currency Forwards [Member] |  |  |  |
Assets | 305 |  |  |
Foreign Currency Forwards [Member] | Level 1[Member] |  |  |  |
Assets | 0 |  |  |
Foreign Currency Forwards [Member] | Level 2 [Member] |  |  |  |
Assets | 305 | [2] |  |
Foreign Currency Forwards [Member] | Level 3 [Member] |  |  |  |
Assets | 0 |  |  |
Fair Value of Long Term Debt [Member] |  |  |  |
Liabilities | 1,304,590 | [3] |  |
Fair Value of Long Term Debt [Member] | Level 1[Member] |  |  |  |
Liabilities | 1,182,173 | [3] |  |
Fair Value of Long Term Debt [Member] | Level 2 [Member] |  |  |  |
Liabilities | 122,417 | [2],[3] |  |
Fair Value of Long Term Debt [Member] | Level 3 [Member] |  |  |  |
Liabilities | 0 | [3] |  |
Level 1[Member] |  |  |  |
Total net liability | 1,182,173 | [1] |  |
Level 2 [Member] |  |  |  |
Total net liability | 132,418 | [1],[2] |  |
Level 3 [Member] |  |  |  |
Total net liability | $ 0 | [1] |  |
[1] | Income Approach. Techniques to convert expected future cash flows to a single present amount based on market expectations (including present value techniques, option-pricing and excess earnings models).
[2] | Unless otherwise indicated, the fair value of our Level 2 derivative instruments reflects our best estimate and is based upon exchange or over-the-counter quotations whenever they are available. Quoted valuations may not be available due to location differences or terms that extend beyond the period for which quotations are available. Where quotes are not available, we utilize other valuation techniques or models to estimate market values. These modeling techniques require us to make estimations of future prices, price correlation and market volatility and liquidity. Our actual results may differ from our estimates, and these differences can be positive or negative.
[3] | We have elected not to record our debt at fair value in the accompanying condensed consolidated balance sheets. See Note 7 for additional information regarding our long term debt. The fair value of our long term debt at June 30, 2011 is as follows:

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + Details
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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + Details
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