Quarterly report pursuant to Section 13 or 15(d)

Basis of Financial Statement Presentation - Inventory (Details)

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Basis of Financial Statement Presentation - Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Raw materials and supplies $ 104,676 $ 97,119
Work in process 91,317 71,374
Finished goods 87,426 88,175
Subtotal 283,419 256,668
Inventory reserves (20,296) (15,539)
Inventories, net $ 263,123 $ 241,129