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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw material $ 101,102 $ 104,104
Work in process 57,337 52,909
Finished goods 163,308 154,150
Total $ 321,747 $ 311,163 [1]
[1] December 31, 2018 balances were derived from audited consolidated financial statements.