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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials and parts $ 166,817 $ 172,082
Work in process 15,838 29,972
Finished goods 252,346 278,661
Gross inventories 435,001 480,715
Inventory reserve (70,346) (66,075)
Inventories $ 364,655 $ 414,640