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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventories [Abstract]    
Finished goods $ 217,708 $ 226,802
Work in process 9,475 10,527
Raw materials 113,048 112,482
Subtotal 340,231 349,811
Unreturned customer inventories 20,325 20,484
Total inventories $ 360,556 $ 370,295