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Pension and Other Post Retirement Plans (Details 6) - USD ($)
$ in Thousands
12 Months Ended
Apr. 01, 2006
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]        
Defined Contribution Plan, Employer Matching Contribution, Percent of Match   75.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 8.00% 8.00%    
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 4.00%      
Statement Defined Contribution Plans [Line Items]        
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date   IAM June 24, 2023UAW December 7, 2025    
Multiple-Employer Plan Accounted for as Multiemployer Plan, Plan Name   IAM National Pension Fund    
U.S. [Member]        
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rate [Abstract]        
Defined Contribution Plan, Cost   $ 32,500 $ 35,900 $ 35,100
U.K. [Member]        
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rate [Abstract]        
Defined Contribution Plan, Cost   4,100 $ 4,100 $ 6,800
U.K. - Belfast [Member]        
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rate [Abstract]        
Defined Contribution Plan, Cost   $ 30