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Interim reporting (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	6 Months Ended
	Mar. 19, 2012	Jun. 30, 2012	Jul. 02, 2011
Quarterly Financial Information Disclosure [Abstract]
Purchase of non-controlling interest	$ 35,000	$ 35,000	$ 0

The cash outflow to return capital to noncontrolled interest, which generally occurs when noncontrolling shareholders reduce their ownership stake (in a subsidiary of the entity). This element does not include dividends paid to noncontrolling shareholders.

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