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Goodwill and Definite and Indefinite-lived Intangible Assets (Definite and Indefinite Lived Intangible Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by major class [Line Items]          
Definite intangible assets $ 58,350   $ 58,350   $ 58,912
Less accumulated amortization (13,214)   (13,214)   (11,540)
Total net 45,136   45,136   47,372
Total Intangible Assets 50,636   50,636   52,872
Amortization of intangibles 875 $ 777 1,756 $ 1,554  
Intangible assets, net 50,636   $ 50,636   52,872
Total assets | Indefinite-lived and Finite-Lived Intangible Assets          
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by major class [Line Items]          
Percentage of total assets     7.00%    
Trade names and trademarks          
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by major class [Line Items]          
Indefinite intangible assets 5,500   $ 5,500   5,500
Trade names and trademarks          
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by major class [Line Items]          
Estimated Useful Lives     25 years    
Definite intangible assets 23,985   $ 23,985   24,276
Customer and dealer relationships          
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by major class [Line Items]          
Definite intangible assets 32,401   $ 32,401   32,654
Customer and dealer relationships | Minimum          
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by major class [Line Items]          
Estimated Useful Lives     10 years    
Customer and dealer relationships | Maximum          
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by major class [Line Items]          
Estimated Useful Lives     14 years    
Patents and drawings          
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by major class [Line Items]          
Definite intangible assets $ 1,964   $ 1,964   $ 1,982
Patents and drawings | Minimum          
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by major class [Line Items]          
Estimated Useful Lives     3 years    
Patents and drawings | Maximum          
Schedule of Acquired Indefinite-lived and Finite Intangible Assets by major class [Line Items]          
Estimated Useful Lives     12 years