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Nature of Operations and Summary of Significant Accounting Policies - Warranty Obligations (Details) - USD ($)
$ in Thousands
6 Months Ended
Jul. 04, 2015
Jun. 28, 2014
Changes in the carrying amount of accrued warranty costs [Roll Forward]    
Balance at beginning of period $ 3,875 $ 4,571
Provision 917 1,284
Usage (1,252) (1,600)
Currency translation (153) (6)
Balance at end of period $ 3,387 $ 4,249