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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Component of inventory use in Restaurant/Retail products [Abstract]    
Finished goods $ 9,159 $ 9,423
Work in process 1,027 443
Component parts 8,355 10,386
Service parts 6,259 5,985
Inventory net 24,800 26,237
Inventory reserves $ 7,000 $ 9,200