Statement of Cash Flows (Unaudited) (Parenthetical) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Statement of Cash Flows [Abstract]
Increase to property, plant and equipment:	$ (36,850)	$ (30,201)
Changes in related accounts payable and accrued liabilities	605	(4,237)
Capital expenditures	$ (36,245)	$ (34,438)