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SIGNIFICANT ACCOUNTING POLICIES - Warranty Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Warranty accruals:    
Balance at beginning of year $ 5,410 $ 5,607
Less: Payments made during the year (3,225) (4,004)
Add: Warranty provision for the current year 3,095 3,788
Changes to warranty provision for prior years (250) 19
Balance at end of year $ 5,030 $ 5,410
Warranty Costs    
Period of limited warranty on structural deck 5 years  
Period of transferable limited warranty to original owner 1 year  
Period of transferable hull warranty available to first subsequent owner 5 years  
Length of period after original retail purchase the 5-year transferable hull warranty terminates 5 years  
Minimum    
Warranty Costs    
Period of non-transferable warranty on additional items 1 year  
Maximum    
Warranty Costs    
Period of non-transferable warranty on additional items 5 years