Significant Accounting Policies Major Components of Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Raw materials and purchased components	$ 196,233	$ 141,566
Service parts, garments and accessories	331,539	316,383
Finished goods	368,410	333,760
Less: reserves	(54,260)	(45,175)
Inventories	$ 841,922	$ 746,534