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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Component of inventory use in Restaurant/Retail products [Abstract]    
Finished goods $ 10,912 $ 9,423
Work in process 701 443
Component parts 10,623 10,386
Service parts 6,609 5,985
Inventory net 28,845 26,237
Inventory reserves $ 7,600 $ 9,200