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Inventories (Inventories) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventories [Abstract]    
Raw materials $ 121,840 $ 112,300
Work in process 54,626 39,454
Finished goods 181,617 172,426
Total inventories $ 358,083 $ 324,180