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Revenue and Geographic Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Revenues $ 761,608 $ 735,994 $ 724,944
Disposal Group, Including Discontinued Operations, Long-lived Assets   229,200  
Long-Lived Assets $ 447,215 $ 662,917  
Revenues, Percentage 100.00% 100.00% 100.00%
Deferred Tax Assets, Net $ 35,240 $ 38,000  
Deferred income taxes   38,040  
U.S. Government contracts      
Disaggregation of Revenue [Line Items]      
Revenues 244,300 281,300 $ 248,600
North America [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 438,638 485,856 437,326
Europe [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 164,921 167,176 168,236
Middle East [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 114,110 51,565 81,197
Asia [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 19,326 16,998 24,614
Oceania [Domain]      
Disaggregation of Revenue [Line Items]      
Revenues 14,598 8,739 10,837
Segment, Geographical, Groups of Countries, Group Six [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 10,015 5,660 2,734
UNITED STATES      
Disaggregation of Revenue [Line Items]      
Long-Lived Assets 249,935 463,114  
GERMANY      
Disaggregation of Revenue [Line Items]      
Long-Lived Assets 157,504 160,257  
UNITED KINGDOM      
Disaggregation of Revenue [Line Items]      
Long-Lived Assets 32,834 32,378  
CZECH REPUBLIC      
Disaggregation of Revenue [Line Items]      
Long-Lived Assets 5,753 6,077  
MEXICO      
Disaggregation of Revenue [Line Items]      
Long-Lived Assets $ 1,189 $ 1,091  
Transferred over Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues, Percentage 39.00% 48.00%  
Transferred at Point in Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenues, Percentage 61.00% 52.00%  
Military and Defense, other than fuzes [Member]      
Disaggregation of Revenue [Line Items]      
Revenues $ 178,289 $ 190,264 201,760
Missile and Bomb Fuzes [Member]      
Disaggregation of Revenue [Line Items]      
Revenues $ 227,846 $ 195,751 $ 184,640
Revenues, Percentage 30.00% 27.00% 25.00%
Commercial Aerospace [Member]      
Disaggregation of Revenue [Line Items]      
Revenues $ 355,473 $ 349,979 $ 338,544
Original Equipment Manufacturer [Member]      
Disaggregation of Revenue [Line Items]      
Revenues, Percentage 58.00% 56.00% 57.00%
Aftermarket [Member]      
Disaggregation of Revenue [Line Items]      
Revenues, Percentage 12.00% 17.00% 18.00%
Time-and-materials Contract [Member] | Minimum [Member]      
Disaggregation of Revenue [Line Items]      
Revenue, Performance Obligation, Description of Timing P30D    
Time-and-materials Contract [Member] | Maximum [Member]      
Disaggregation of Revenue [Line Items]      
Revenue, Performance Obligation, Description of Timing P180D    
Fixed-price Contract [Member] | Minimum [Member]      
Disaggregation of Revenue [Line Items]      
Revenue, Performance Obligation, Description of Timing P30D    
Fixed-price Contract [Member] | Maximum [Member]      
Disaggregation of Revenue [Line Items]      
Revenue, Performance Obligation, Description of Timing P90D