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Other Non-Current Assets (Tables)
 3 Months Ended
Mar. 31, 2018
Other Assets, Longterm [Abstract]  
Schedule of Other Assets, Noncurrent [Table Text Block]
Other assets, long-term consist of the following (in thousands):
 
March 31,
2018
 
December 30,
2017
Prepaid deposits
$
2,670

 
$
3,286

Long term investments
1,271

 
1,234

Restricted cash(1)
152

 
148

Total other assets, long-term
$
4,093

 
$
4,668

______________
(1) Restricted cash long term is generally related to collateral for certain lease deposits or other bank guarantees.