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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment gross | $ 205,180 | $ 210,671
Less Accumulated Depreciation | 92,681 | 103,993
Total Property, Plant and Equipment, Net | 112,499 | 106,678
Aerospace |  |
Property, Plant and Equipment [Line Items] |  |
Impairment of long-lived assets held-for-use | 2,300 |
Held for Sale | Test Systems |  |
Property, Plant and Equipment [Line Items] |  |
Net property, plant and equipment | 1,500 |
Land |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment gross | 9,802 | 9,891
Building and Improvements |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment gross | 74,723 | 75,493
Machinery and Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment gross | 115,202 | 119,444
Construction in Progress |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment gross | $ 5,453 | $ 5,843

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