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Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventory    
Serialized parts $ 45,568  
Non-serialized parts 43,439 $ 34,335
Total Inventory, gross 89,007 34,335
Less: obsolete and slow moving reserve   (1,114)
Total Inventory, net $ 89,007 $ 33,221