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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Inventories carried at LIFO:    
Finished goods $ 43,300 $ 39,142
Raw materials, production parts and work-in-process 25,612 23,980
LIFO reserve (28,190) (28,190)
Total LIFO inventories 40,722 34,932
Inventories carried at FIFO:    
Finished goods 34,274 31,044
Raw materials, production parts and work-in-process 13,097 12,646
Total FIFO inventories 47,371 43,690
Total inventories $ 88,093 $ 78,622