Significant Accounting Policies Major Components of Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Raw materials and purchased components	$ 536,600	$ 344,600
Service parts, garments and accessories	320,600	357,000
Finished goods	420,800	476,200
Less: reserves	(64,500)	(56,700)
Inventories	$ 1,213,500	$ 1,121,100