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Recently Adopted Accounting Standards, ASU 2014-09, Cumulative Impact of Changes on Balance Sheet (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Customer deposits $ 28,313 $ 27,813
Customer deposits, revenue recognized 19,800  
Assets [Abstract]    
Estimated to be returned inventory 745 0
Deferred income taxes 13,095 12,375
Liabilities [Abstract]    
Refund on estimated returns and allowances 1,971 0
Reserve for cancelled sales and allowances 0 1,463
Equity [Abstract]    
Retained earnings $ 290,044 287,390
Maximum [Member]    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Percentage of sales financed 1.00%  
Payment period for receivables 1 year  
Delivery period 1 year  
ASU 2014-09 [Member]    
Assets [Abstract]    
Estimated to be returned inventory   786
Deferred income taxes   12,331
Liabilities [Abstract]    
Refund on estimated returns and allowances   2,072
Reserve for cancelled sales and allowances   0
Equity [Abstract]    
Retained earnings   287,523
Adjustments Due to ASC 606 [Member] | ASU 2014-09 [Member]    
Assets [Abstract]    
Estimated to be returned inventory $ 745 786
Deferred income taxes (44) (44)
Liabilities [Abstract]    
Refund on estimated returns and allowances 1,971 2,072
Reserve for cancelled sales and allowances (1,407) (1,463)
Equity [Abstract]    
Retained earnings 137 $ 133
Balance Without Adoption of ASC 606 [Member] | ASU 2014-09 [Member]    
Assets [Abstract]    
Estimated to be returned inventory 0  
Deferred income taxes 13,139  
Liabilities [Abstract]    
Refund on estimated returns and allowances 0  
Reserve for cancelled sales and allowances 1,407  
Equity [Abstract]    
Retained earnings $ 289,907