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Inventories, net - Schedule of components of inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Component of inventory use in hospitality product [Abstract]    
Finished Goods $ 9,535 $ 9,423
Work in process 766 443
Component parts 5,480 10,386
Service parts 5,965 5,985
Inventories, net 21,746 26,237
Inventory reserves $ 10,000 $ 9,200