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Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jul. 01, 2017
USD ($)
Apr. 01, 2017
USD ($)
Jun. 30, 2018
USD ($)
Segment
Jul. 01, 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 $ 10,735     $ 10,735     $ 15,960
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Revenue recognized 2,788     30,113      
Cumulative-effect adjustment to increase retained earnings 361,262     361,262     342,893
Reclassification from operating income 19,735 $ 11,660   36,399 $ 23,910    
Reclassification to other expense, net $ 245 217   $ 491 421    
Future lease payments due after next fiscal year             $ 8,100
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   $ (217)     $ (421)    
Reclassification to other expense, net     $ 204        
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 94.00%     95.00%      
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 6.00%     5.00%