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Statement of Cash Flows (Unaudited) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Statement of Cash Flows [Abstract]    
Increases to property, plant and equipment $ (27,471) $ (54,479)
Changes in related accounts payable and accrued liabilities 5,573 7,332
Capital expenditures $ (21,898) $ (47,147)