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Related Parties - Schedule of Related Parties (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Related Party Transactions [Abstract]      
Sales to related parties $ 2,360 $ 953  
Fees paid to directors and officers 809 827  
Payments to other related parties 926 $ 988  
Due from VS 6,592   $ 6,229
Due from other related parties 2,904   2,010
Due from related parties, current 9,496   8,239
Due to related parties - Current 1,623   1,500
Due to related parties - Long Term $ 600   $ 600