Major Customers and Concentrations of Credit Risk - Sales to Major Customers (Details) - Customer Concentration Risk - Revenue from Contract with Customer Benchmark	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Boeing
Revenue, Major Customer [Line Items]
Concentration percentage	7.80%	10.50%	16.60%
Lockheed Martin
Revenue, Major Customer [Line Items]
Concentration percentage	4.40%	5.00%	4.00%
Northrop
Revenue, Major Customer [Line Items]
Concentration percentage	7.10%	9.10%	4.00%
Raytheon
Revenue, Major Customer [Line Items]
Concentration percentage	24.40%	20.90%	15.60%
Spirit
Revenue, Major Customer [Line Items]
Concentration percentage	3.80%	3.30%	12.20%
Top ten customers
Revenue, Major Customer [Line Items]
Concentration percentage	61.10%	61.10%	65.40%