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Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 29, 2018 USD ($) Segment	Sep. 30, 2017 USD ($)	Jan. 01, 2018 USD ($)	Dec. 30, 2017 USD ($)
Accounting Policies [Abstract]
Number of reportable segments | Segment			2
Bank guarantees, expiration period			12 months
Banker's acceptance drafts, maturity period			6 months
Banker's acceptance drafts	$ 14,193		$ 14,193			$ 15,960
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue recognized	5,787		35,900
Cumulative-effect adjustment to increase retained earnings	377,602		377,602			$ 342,893
Reclassification from operating income	27,375	$ 19,674	63,774	$ 43,584
Reclassification to other expense, net	245	216	736	637
ASU No. 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment to increase retained earnings					$ 119
ASU No. 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification from operating income		$ (216)		$ (637)
Reclassification to other expense, net	$ 216		$ 637
Timing Of Transfer Of Good Or Service [Member] | Point in Time [Member] | Revenue from Contract with Customer [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage	90.00%		93.00%
Timing Of Transfer Of Good Or Service [Member] | Over Time [Member] | Revenue from Contract with Customer [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage	10.00%		7.00%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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