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Segment and geographic information (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Revenue and Assets
Revenue	$ 167,610	$ 53,665
Property, plant, and equipment, net	1,549,626	284,018	1,388,254
United States
Revenue and Assets
Revenue	104,325	53,665
Property, plant, and equipment, net	972,213	284,018
Canada
Revenue and Assets
Revenue	63,285
Property, plant, and equipment, net	$ 577,413

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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