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Inventories and Contracts in Progress (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventories and Contracts in Progress [Abstract]    
Raw materials $ 30,429 $ 20,646
Work-in-process 10,258 5,368
Finished goods 18,851 8,490
Contracts in Progress 1,074 314
Inventories and contracts in progress $ 60,612 $ 34,818