Significant Accounting Policies Major Components of Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Raw materials and purchased components	$ 249,259	$ 194,108
Service parts, garments and accessories	345,716	307,684
Finished goods	477,293	329,288
Less: reserves	(52,751)	(47,119)
Inventories	$ 1,019,517	$ 783,961