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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventories carried at LIFO:    
Finished goods $ 39,142 $ 41,225
Raw materials, production parts and work-in-process 23,980 22,158
LIFO Reserve (28,190) (27,645)
Total LIFO inventories 34,932 35,738
Inventories carried at FIFO:    
Finished goods 31,044 32,421
Raw materials, production parts and work-in-process 12,646 13,812
Disposal Group, Including Discontinued Operation, FIFO Inventory, Current 0 (4,679)
Total FIFO inventories 43,690 41,554
Inventories $ 78,622 $ 77,292