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Recently Adopted Accounting Standards, ASU 2014-09, Cumulative Impact of Changes on Balance Sheet (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Recently Adopted Accounting Standards, ASU 2014-09 [Abstract]
Customer deposits	$ 29,352	$ 27,813
Customer deposits, revenue recognized	27,500
Assets [Abstract]
Estimated to be returned inventory	769	0
Deferred income taxes	12,648	12,375
Liabilities [Abstract]
Refund on estimated returns and allowances	2,026	0
Reserve for cancelled sales and allowances	0	1,463
Equity [Abstract]
Retained earnings	$ 292,465	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		12,331
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	$ 769	786
Deferred income taxes	(44)	(44)
Liabilities [Abstract]
Refund on estimated returns and allowances	2,026	2,072
Reserve for cancelled sales and allowances	(1,437)	(1,463)
Equity [Abstract]
Retained earnings	136	$ 133
Balance Without Adoption of ASC 606 [Member] | ASU 2014-09 [Member]
Assets [Abstract]
Estimated to be returned inventory	0
Deferred income taxes	12,692
Liabilities [Abstract]
Refund on estimated returns and allowances	0
Reserve for cancelled sales and allowances	1,437
Equity [Abstract]
Retained earnings	$ 292,329

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