Additional Long Term Debt Textuals.

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Line Of Credit Facility Borrowing Base.

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- Definition

Line Of Credit Facility Commitment Term.

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- Definition

Long term debt.

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- Definition

Interest rate stated in the contractual debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

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- Definition

Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 4

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- Definition

Amount of outstanding principal due under the debt instrument at the end of the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number APB14-1
-Paragraph 31
-Subparagraph b

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- Definition

Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 26
-Paragraph 20, 21

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- Definition

Description of the fees for amounts available, but unused under the credit 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

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- Definition

Description of the conditions for borrowing under the credit facility including the nature of any restrictions.

+ References

+ Details

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

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- Definition

Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

+ References

+ Details

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- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

+ Details

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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

+ Details

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- Definition

The consolidating entity's interest in net assets of the subsidiary, expressed as a percentage.

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 20
-Subparagraph b

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Long-Term Debt (Details Textual) (USD $)	6 Months Ended				12 Months Ended	6 Months Ended
Long-Term Debt (Details Textual) (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 8 3/8% Senior Notes due 2017 [Member]	Jun. 30, 2011 6 7/8% Senior Notes due 2012 [Member]	Dec. 31, 2010 6 7/8% Senior Notes due 2012 [Member]	Jun. 30, 2011 7 3/4% Senior Notes due 2019 [Member]
Long-Term Debt (Textuals) [Abstract]
Outstanding senior notes	$ 0		$ 300,000,000		$ 172,000,000	$ 300,000,000
Interest rate on senior notes			8.375%		6.875%	7.75%
Repurchase of Senior Notes due 2012	287,000,000	3,000,000		172,400,000
Loss resulted due to early extinguishment of senior notes				1,100,000
Maturity of credit facility			Oct. 15, 2017		Mar. 01, 2012	Apr. 01, 2019
Additional Long-Term Debt (Textuals) [Abstract]
Bank credit facility	850,000,000
Line of credit facility commitment term (in years)	5 years
Maturity of credit facility	On 30 November, 2015
Maximum borrowing base	500,000,000
Availability of borrowing base	$ 405,000,000
Interest rate description based on utilization of borrowing base at company option	either (1) LIBOR plus 1.75% to 2.75% or (2) the base rate (which is the higher of the administrative agent’s prime rate, the federal funds rate plus 0.5% or 30 day LIBOR plus 1.0%) plus 0.75% to 1.75%
Commitment fee	0.5% on unused borrowing base
Description of covenants under credit facility	Restrict the payment of cash dividends in excess of 50.0 million
Ownership percentage of guarantor subsidiary	100.00%