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Other Non-Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Other Assets, Longterm [Abstract]    
Prepaid deposits $ 2,670 $ 3,286
Long term investments 1,271 1,234
Restricted cash(1) 152 148
Other non-current assets $ 4,093 $ 4,668