Supplemental Disclosures to the Condensed Consolidated Balance Sheets and Condensed Consolidated Statements of Cash Flows, Cash Flows (Details) (USD $) In Thousands	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010
Balance Sheet and Cash Flow Supplemental Disclosures [Abstract]
Cash payments for interest, net of amounts capitalized	$ 163,345	$ 55,404
Cash payments for income taxes	487	1,785
Noncash investing activities - liabilities assumed
Fair value of assets acquired	854,224	896,999
Cash paid, net of cash acquired	(846,976)	(872,621)
Receivables from sellers	2,662	12,620
Payables to sellers	(6,662)	0
Liabilities assumed	$ 3,248	$ 36,998

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The amount of payable to the seller recorded in a business or asset acquisition that was partially a noncash transaction. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or payments.

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The amount of receivable from the seller recorded in a business or asset acquisition that was partially a noncash transaction. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or payments.

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The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale, less deposits for acquisitions.

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The fair value of assets acquired in noncash investing or financing activities.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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

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The fair value of liabilities assumed in noncash investing or financing activities.

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