Significant Accounting Policies Major Components of Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Raw materials and purchased components	$ 280,249	$ 233,258
Service parts, garments and accessories	355,042	342,593
Finished goods	565,601	442,003
Less: reserves	(52,255)	(48,343)
Inventories	$ 1,148,637	$ 969,511