| Summary of Segment Reporting Information | 
 Segment information and reconciliations to consolidated amounts for the years ended December 31 are as follows: 
 | 
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 | 
 | 
 | 
 | 
 | 
 | 
 | 
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 | 
 | 
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 | 
 | 
 | 
 
| (In thousands) | 
2019 | 
 | 
2018 | 
 | 
2017 | 
 
| Sales: | 
 | 
 | 
 | 
 | 
 | 
 
| Aerospace | 
$ | 
692,614  | 
  | 
 | 
$ | 
675,744  | 
  | 
 | 
$ | 
534,724  | 
  | 
 
| Less Inter-segment Sales | 
(5) | 
  | 
 | 
(119) | 
  | 
 | 
(121) | 
  | 
 
| Total Aerospace Sales | 
692,609  | 
  | 
 | 
675,625  | 
  | 
 | 
534,603  | 
  | 
 
 | 
 | 
 | 
 | 
 | 
 | 
 
| Test Systems | 
80,495  | 
  | 
 | 
127,679  | 
  | 
 | 
89,861  | 
  | 
 
| Less Inter-segment Sales | 
(402) | 
  | 
 | 
(48) | 
  | 
 | 
—  | 
  | 
 
| Test Systems | 
80,093  | 
  | 
 | 
127,631  | 
  | 
 | 
89,861  | 
  | 
 
| Total Consolidated Sales | 
$ | 
772,702  | 
  | 
 | 
$ | 
803,256  | 
  | 
 | 
$ | 
624,464  | 
  | 
 
| Operating Profit and Margins: | 
 | 
 | 
 | 
 | 
 | 
 
| Aerospace | 
$ | 
16,657  | 
  | 
 | 
$ | 
69,761  | 
  | 
 | 
$ | 
38,888  | 
  | 
 
 | 
2.4  | 
% | 
 | 
10.3  | 
% | 
 | 
7.3  | 
% | 
 
| Test Systems | 
4,494  | 
  | 
 | 
10,718  | 
  | 
 | 
7,359  | 
  | 
 
 | 
5.6  | 
% | 
 | 
8.4  | 
% | 
 | 
8.2  | 
% | 
 
| Total Operating Profit | 
$ | 
21,151  | 
  | 
 | 
$ | 
80,479  | 
  | 
 | 
$ | 
46,247  | 
  | 
 
 | 
2.7  | 
% | 
 | 
10.0  | 
% | 
 | 
7.4  | 
% | 
 
| Additions to (Deductions from) Operating Profit: | 
 | 
 | 
 | 
 | 
 | 
 
| Net Gain on Sale of Businesses | 
$ | 
78,801  | 
  | 
 | 
$ | 
—  | 
  | 
 | 
$ | 
—  | 
  | 
 
| Interest Expense, Net of Interest Income | 
(6,141) | 
  | 
 | 
(9,710) | 
  | 
 | 
(5,369) | 
  | 
 
| Corporate and Other Expenses, Net | 
(25,508) | 
  | 
 | 
(18,487) | 
  | 
 | 
(15,887) | 
  | 
 
| Income before Income Taxes | 
$ | 
68,303  | 
  | 
 | 
$ | 
52,282  | 
  | 
 | 
$ | 
24,991  | 
  | 
 
| Depreciation and Amortization: | 
 | 
 | 
 | 
 | 
 | 
 
| Aerospace | 
$ | 
27,879  | 
  | 
 | 
$ | 
29,947  | 
  | 
 | 
$ | 
22,111  | 
  | 
 
| Test Systems | 
4,534  | 
  | 
 | 
4,500  | 
  | 
 | 
4,302  | 
  | 
 
| Corporate | 
636  | 
  | 
 | 
585  | 
  | 
 | 
650  | 
  | 
 
| Total Depreciation and Amortization | 
$ | 
33,049  | 
  | 
 | 
$ | 
35,032  | 
  | 
 | 
$ | 
27,063  | 
  | 
 
| Assets: | 
 | 
 | 
 | 
 | 
 | 
 
| Aerospace | 
$ | 
629,371  | 
  | 
 | 
$ | 
647,870  | 
  | 
 | 
$ | 
621,047  | 
  | 
 
| Test Systems | 
110,994  | 
  | 
 | 
97,056  | 
  | 
 | 
90,859  | 
  | 
 
| Corporate | 
42,351  | 
  | 
 | 
29,714  | 
  | 
 | 
24,050  | 
  | 
 
| Total Assets | 
$ | 
782,716  | 
  | 
 | 
$ | 
774,640  | 
  | 
 | 
$ | 
735,956  | 
  | 
 
| Capital Expenditures: | 
 | 
 | 
 | 
 | 
 | 
 
| Aerospace | 
$ | 
11,552  | 
  | 
 | 
$ | 
14,680  | 
  | 
 | 
$ | 
10,656  | 
  | 
 
| Test Systems | 
380  | 
  | 
 | 
1,370  | 
  | 
 | 
2,721  | 
  | 
 
| Corporate | 
151  | 
  | 
 | 
267  | 
  | 
 | 
101  | 
  | 
 
| Total Capital Expenditures | 
$ | 
12,083  | 
  | 
 | 
$ | 
16,317  | 
  | 
 | 
$ | 
13,478  | 
  | 
 
  
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| Summarizes the Company's Sales and Long-Lived Assets by Geographic Region | 
 The following table summarizes the Company’s sales into the following geographic regions for the years ended December 31: 
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| (In thousands) | 
2019 | 
 | 
2018 | 
 | 
2017 | 
 
| United States | 
$ | 
583,589  | 
  | 
 | 
$ | 
575,830  | 
  | 
 | 
$ | 
482,219  | 
  | 
 
| North America (excluding United States) | 
12,585  | 
  | 
 | 
10,834  | 
  | 
 | 
6,198  | 
  | 
 
| Asia | 
40,764  | 
  | 
 | 
112,135  | 
  | 
 | 
58,732  | 
  | 
 
| Europe | 
130,227  | 
  | 
 | 
98,193  | 
  | 
 | 
73,677  | 
  | 
 
| South America | 
862  | 
  | 
 | 
1,973  | 
  | 
 | 
1,280  | 
  | 
 
| Other | 
4,675  | 
  | 
 | 
4,291  | 
  | 
 | 
2,358  | 
  | 
 
| Total | 
$ | 
772,702  | 
  | 
 | 
$ | 
803,256  | 
  | 
 | 
$ | 
624,464  | 
  | 
 
  
The following table summarizes the Company’s property, plant and equipment by country for the years ended December 31: 
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| (In thousands) | 
2019 | 
 | 
2018 | 
 
| United States | 
$ | 
101,169  | 
  | 
 | 
$ | 
110,738  | 
  | 
 
| France | 
8,740  | 
  | 
 | 
9,241  | 
  | 
 
| India | 
1,509  | 
  | 
 | 
—  | 
  | 
 
| Canada | 
1,081  | 
  | 
 | 
883  | 
  | 
 
| Total | 
$ | 
112,499  | 
  | 
 | 
$ | 
120,862  | 
  | 
 
  
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