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Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
3 Months Ended
Apr. 01, 2017
USD ($)
Segment
Apr. 02, 2016
USD ($)
Dec. 31, 2016
USD ($)
Accounting Policies [Abstract]      
Number of reportable segments | Segment 2    
Business Acquisition [Line Items]      
Additional post-closing consideration $ 165 $ 0  
Restricted Cash $ 1,543   $ 2,082
Banker's acceptance drafts, maturity period 6 months    
Banker's acceptance drafts $ 9,229   $ 7,852
PAAL [Member]      
Business Acquisition [Line Items]      
Additional post-closing consideration $ 165