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Nature of Operations and Summary of Significant Accounting Policies - Warranty Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 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 715 804
Usage (364) (570)
Currency translation 61 62
Balance at March 31, 2018 $ 5,910 $ 4,139