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Cash flow information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flow information [Abstract]
Interest, net of amount capitalized	$ 22,433	$ 25,579
Income taxes, net	285	9,981
Property, plant and equipment additions in accounts payable	$ 51,739	$ 15,838

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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