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Cash flow information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flow information [Abstract]
Interest, net of amount capitalized	$ 21,857	$ 22,433
Income taxes paid (refunded), net	(7,246)	285
Property, plant and equipment additions in accounts payable	$ 92,236	$ 51,739

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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