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Statement of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Cash Flows [Abstract]
Increases to property, plant and equipment	$ (132,445)	$ (115,677)	$ (117,629)
Changes in related accounts payable and accrued liabilities	(1,885)	566	(2,607)
Capital expenditures	$ (134,330)	$ (115,111)	$ (120,236)

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.

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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