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Nature of Operations and Summary of Significant Accounting Policies - Warranty Obligations (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Changes in the carrying amount of accrued warranty costs [Roll Forward]    
Balance at December 30, 2017 $ 5,498 $ 3,843
Provision charged to expense 1,656 1,209
Usage (881) (1,056)
Currency translation (192) 224
Balance at June 30, 2018 $ 6,081 $ 4,220