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Accounts Receivable, net (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Carrying amount of accounts receivable $ 189,279 $ 188,774 $ 192,534
Loss allowance for lifetime expected credit 0    
No Past Due [Member]      
Carrying amount of accounts receivable $ 186,654 186,681 188,414
Weighted average loss rate 0.00%    
Loss allowance for lifetime expected credit $ 0    
Past due within 30 days [Member]      
Carrying amount of accounts receivable $ 2,622 1,506 3,875
Weighted average loss rate 0.00%    
Loss allowance for lifetime expected credit $ 0    
Past due 31-60 days [Member]      
Carrying amount of accounts receivable 3 396 347
Loss allowance for lifetime expected credit $ 0    
Past due 31-60 days [Member] | Bottom of range [member]      
Weighted average loss rate 0.00%    
Past due 31-60 days [Member] | Top of range [member]      
Weighted average loss rate 0.01%    
Past due 61-90 days [Member]      
Carrying amount of accounts receivable $ 0 0 0
Loss allowance for lifetime expected credit $ 0    
Past due 61-90 days [Member] | Bottom of range [member]      
Weighted average loss rate 0.00%    
Past due 61-90 days [Member] | Top of range [member]      
Weighted average loss rate 6.29%    
Past due 91-120 days [Member]      
Carrying amount of accounts receivable $ 0 1 0
Loss allowance for lifetime expected credit $ 0    
Past due 91-120 days [Member] | Bottom of range [member]      
Weighted average loss rate 0.00%    
Past due 91-120 days [Member] | Top of range [member]      
Weighted average loss rate 18.21%    
Past due over 121 days [Member]      
Carrying amount of accounts receivable $ 0 $ 190 $ 1,293
Weighted average loss rate 100.00%    
Loss allowance for lifetime expected credit $ 0