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Summary of Signficant Accounting Policies Schedule of Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Product Information
Inventories		$ 394,259
Inventories	$ 2,772,777	2,836,075	$ 2,380,783
Aftermarket and refurbished products
Product Information
Inventories	2,297,895	2,309,458
Salvage and remanufactured products
Product Information
Inventories	447,908	503,199
ManufacturedProducts [Member]
Accounting Policies [Abstract]
Inventory, Raw Materials, Gross	17,000	17,000
Inventory, Work in Process, Gross	3,000	2,000
Inventory, Finished Goods, Gross	6,000	4,000
Product Information
Inventories	$ 26,974	$ 23,418

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