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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 30, 2017
Commitments and Contingencies Disclosure [Abstract]    
Banker's acceptance drafts, maturity period 6 months  
Banker's acceptance drafts with recourse $ 10,433 $ 10,035