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Condensed Consolidated Statement of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Condensed Consolidated Statement of Cash Flows [Abstract]
Increase to property, plant and equipment	$ (202,133)	$ (171,032)
Changes in related accounts payable and accrued liabilities	10,130	10,252
Property, plant and equipment additions, net of equity AFUDC*	$ (192,003)	$ (160,780)

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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