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Nature of Operations and Summary of Significant Accounting Policies - Warranty Obligations (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Changes in the carrying amount of accrued warranty costs [Roll Forward]    
Balance at Beginning of Year $ 3,843 $ 3,670
Provision charged to income 1,931 2,454
Usage (1,506) (2,574)
Acquisitions 790 991
Currency translation 382 (19)
Balance at End of Period $ 5,440 $ 4,522