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Supplemental Cash Flow Information (Details) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Non-cash investing and financing activities included:
Asset retirement costs capitalized, net	$ 12,717	$ 864
Unproved property purchased with stock		20,000
Net cash provided from operating activities included:
Interest paid	68,002	58,457
Income taxes paid (refunded)	$ 308	$ (684)

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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