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Description of Business and Summary of Significant Accounting Policies, Impact of Changes on Balance Sheet (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2017
Recently Adopted Accounting Standards, ASU 2014-09 [Abstract]
Customer deposits	$ 24,465		$ 27,813
Customer deposits, revenue recognized	27,730
Assets [Abstract]
Estimated to be returned inventory	730		0
Deferred income taxes	12,544		12,375
Liabilities [Abstract]
Refund on estimated returns and allowances	1,950		0
Reserve for cancelled sales and allowances	0		1,464
Equity [Abstract]
Retained earnings	$ 282,366		287,390
Maximum [Member]
Recently Adopted Accounting Standards, ASU 2014-09 [Abstract]
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			12,330
Liabilities [Abstract]
Refund on estimated returns and allowances			2,072
Reserve for cancelled sales and allowances			0
Equity [Abstract]
Retained earnings			287,523
ASU 2016-09 [Member]
Recently Adopted Accounting Standards, ASU 2014-09 [Abstract]
Tax (cost) benefit related to stock-based plans		$ (121)
Adjustments Due to ASC 606 [Member] | ASU 2014-09 [Member]
Assets [Abstract]
Estimated to be returned inventory	$ 730		786
Deferred income taxes	(38)		(45)
Liabilities [Abstract]
Refund on estimated returns and allowances	1,950		2,072
Reserve for cancelled sales and allowances	(1,373)		(1,464)
Equity [Abstract]
Retained earnings	115		$ 133
Balance Without Adoption of ASC 606 [Member] | ASU 2014-09 [Member]
Assets [Abstract]
Estimated to be returned inventory	0
Deferred income taxes	12,582
Liabilities [Abstract]
Refund on estimated returns and allowances	0
Reserve for cancelled sales and allowances	1,373
Equity [Abstract]
Retained earnings	$ 282,251

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