Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Goodwill and other intangible assets	$ 3,854	$ 5,773
Stock-based compensation	2,956	7,607
Deferred compensation	6,710	5,387
Warranty	10,931	9,282
Inventory	6,375	5,591
Other	4,276	2,966
Net operating loss and interest carryforwards - foreign	1,467	12
Total deferred tax assets	36,569	36,618
Less: Valuation allowance - foreign	(1,261)	0
Total deferred tax assets net of valuation allowance	35,308	36,618
Fixed assets	(24,360)	(12,462)
Net deferred tax assets	$ 10,948	$ 24,156