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Investments, Available-For-Sale	6 Months Ended
	Jun. 30, 2011
Investments, Available-For-Sale
Investments, Available-For-Sale	D.        Investments, Available-For-Sale As of December 31, 2010 the investments classified by the Company as available-for-sale consisted of $29.0 million of equity and bond funds intended to fund plugging and abandonment and other liabilities for which the Company self-insures. During the six month period ended June 30, 2011, the Company sold all of the available-for-sale securities for proceeds of $29.9 million which resulted in gross realized gains of $8.5 million, $4.9 million of which was reclassified from accumulated other comprehensive income.  The Company uses the average cost method to determine the cost of securities sold. During the six month period ended June 30, 2010, the Company purchased additional securities with a cost basis totaling $0.8 million.

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- Definition

This item represents the entire disclosure related to Investments in Certain Debt and Equity Securities (and certain other trading assets) which include all debt and equity securities (other than those equity securities accounted for under the equity or cost methods of accounting) with readily determinable fair values. Other trading assets include assets that are carried on the balance sheet at fair value and held for trading purposes. A debt security represents a creditor relationship with an enterprise that is in the form of a security. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities (and other trading assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 3, 19, 20, 21, 22, 137

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