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Related Parties - Schedule of Related Parties (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Related Party Transactions [Abstract]          
Sales to related parties $ 1,624 $ 1,184 $ 3,984 $ 2,137  
Fees paid to directors and officers 1,013 801 1,822 1,628  
Payments to other related parties 907 $ 674 1,833 $ 1,662  
Due from VS 6,934   6,934   $ 6,229
Due from other related parties 2,462   2,462   2,010
Due from related parties, current 9,396   9,396   8,239
Due to related parties - current 4,335   4,335   1,500
Due to related parties - long term $ 611   $ 611   $ 600