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Significant Accounting Policies Major Components of Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Raw materials and purchased components $ 281,934 $ 233,258
Service parts, garments and accessories 341,076 342,593
Finished goods 562,252 442,003
Less: reserves (54,998) (48,343)
Inventories $ 1,130,264 $ 969,511