Income taxes (Tables)

3 Months Ended

Mar. 28, 2014

Income taxes [Abstract]

Income tax expense

The income tax expense for the three months ended March 28, 2014 and March 29, 2013 was as follows (in thousands):

	March 28, 2014			March 29, 2013
Income tax expense	$	472		$	434
Effective tax rate		(5.5	)%		(6.5	)%