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Related Parties - Schedule of Related Parties (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Related Party Transactions [Abstract]          
Sales to related parties $ 1,667 $ 1,267 $ 3,804 $ 3,732  
Fees paid to directors and officers 833 573 2,461 2,114  
Payments to other related parties 863 $ 788 2,525 $ 2,660  
Due from VS 5,786   5,786   $ 6,240
Due from other related parties 2,210   2,210   2,260
Due from related parties, current 7,996   7,996   8,500
Due to related parties $ 1,018   $ 1,018   $ 975