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Variable Interest Entity (VIE) (Tables)
 6 Months Ended
Jul. 04, 2015
Variable Interest Entity [Abstract]  
Changes in Noncontrolling Interest for Cercacor
 
Six Months Ended 
 July 4, 2015
Noncontrolling interest, beginning of period
$
1,742

Increase in additional paid-in capital of noncontrolling interest
6

Net loss attributable to noncontrolling interest
1,356

     Noncontrolling interest, end of period
$
392