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Supplemental Disclosures to the Consolidated Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Net cash provided by operating activities included:
Cash payments for interest	$ 54,306	$ 38,372
Interest capitalized	(1,927)	(1,195)
Cash payments for interest, net of amounts capitalized	52,379	37,177
Cash (receipts) payments for income taxes	155	0
Non-cash investing activities included:
Asset retirement costs capitalized	416	242
Oil and natural gas properties acquired through increase (decrease) in accounts payable and accrued liabilities	$ 39,418	$ (4,920)

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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