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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw material $ 71,511 $ 82,397
Work in process 64,137 42,304
Finished goods 156,192 163,956
Total $ 291,840 $ 288,657 [1]
[1] December 31, 2017 balances were derived from audited consolidated financial statements.