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Goodwill and intangible assets (Schedule of intangible assets amortization expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 6,774	$ 15,998	$ 12,748	$ 32,259

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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