Quarterly report pursuant to Section 13 or 15(d)

Warranty Liability (Details)

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Warranty Liability (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Warranty liability        
Period of warranty history used in estimating warranty costs 5 years      
Company's warranty liability:        
Balance at the beginning of the period $ 5,188,000 $ 2,930,000 $ 6,279,000 $ 3,808,000.000
Warranty provision 1,133,000 1,359,000 1,781,000.000 1,818,000.000
Claims paid/settlements (680,000) (655,000) (2,419,000.000) (1,992,000.000)
Balance at the end of the period $ 5,641,000 $ 3,634,000.000 $ 5,641,000 $ 3,634,000.000
Snow and ice control equipment        
Warranty liability        
Warranty period 2 years      
Parts and accessories        
Warranty liability        
Warranty period 1 year      
Certain snowplows        
Warranty liability        
Warranty period 1 year