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Definite- and Indefinite-Lived Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by Major Class [Line Items]    
Accumulated amortization $ 11,540 $ 8,152
2018 3,500  
2019 3,500  
2020 3,500  
2021 3,500  
2022 3,500  
Trade names and trademarks    
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by Major Class [Line Items]    
Carrying values of indefinite lived trade names 5,500 $ 5,500
Trade Names | Gradall    
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by Major Class [Line Items]    
Carrying values of indefinite lived trade names 3,600  
Trade Names | Bush Hog    
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by Major Class [Line Items]    
Carrying values of indefinite lived trade names 1,900  
Trade names and trademarks    
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by Major Class [Line Items]    
Net carrying value of intangibles with definite useful lives 22,331  
Accumulated amortization 3,243  
Customer and dealer relationships    
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by Major Class [Line Items]    
Net carrying value of intangibles with definite useful lives 23,657  
Accumulated amortization 7,699  
Patents and drawings    
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by Major Class [Line Items]    
Net carrying value of intangibles with definite useful lives 1,384  
Accumulated amortization $ 598