Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Inventory [Line Items]
Raw materials	$ 19,502	$ 15,012
Contracts and other work in process (including certain general stock materials)	64,237	36,130
Finished goods	36,329	24,959
Inventories	185,072	156,353
Inventories include amounts associated with matters such as contract changes, negotiated settlements and claims for unanticipated contract costs	500	400
Segment work in progress	64,237	36,130
K-MAX® program
Schedule of Inventory [Line Items]
Total program inventory	60,400	43,600
Inventory, Noncurrent	19,900
SH-2G(I)
Schedule of Inventory [Line Items]
Contracts and other work in process (including certain general stock materials)	6,300	3,600
Segment work in progress	6,300	3,600
Inventory, Noncurrent	5,300
U.S. Government contracts
Schedule of Inventory [Line Items]
U.S. Government	5,439	6,217
Commercial and other government contracts
Schedule of Inventory [Line Items]
Commercial and other government contracts	$ 59,565	$ 74,035

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