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Industry Segments and Geographic Information - Geographic Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues from external customers | $ 388,272 | $ 377,715 | $ 561,241
Total identifiable assets | 398,266 | 1,132,839 |
Geography Eliminations |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues from external customers | (195) | (848) | (1,802)
Operating Segments |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues from external customers | 388,272 | 377,715 | 561,241
Operating Segments | Discontinued operations |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total identifiable assets | 0 | 710,006 |
United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues from external customers | 251,786 | 225,835 | 411,284
United States | Reportable Geographical Components |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues from external customers | 251,786 | 225,835 | 411,284
Total identifiable assets | 291,986 | 285,765 |
Canada and Mexico | Reportable Geographical Components |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues from external customers | 5,363 | 1,347 | 6,616
Total identifiable assets | 5,891 | 6,452 |
South America | Reportable Geographical Components |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues from external customers | 10,473 | 11,583 | 13,188
Total identifiable assets | 21,837 | 10,388 |
Europe | Reportable Geographical Components |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues from external customers | 88,136 | 90,303 | 93,327
Total identifiable assets | 72,685 | 85,733 |
Europe | Geography Eliminations |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues from external customers | 195 | 848 | 1,802
Africa | Reportable Geographical Components |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues from external customers | 2,262 | 8,128 | 16,874
Total identifiable assets | 199 | 9,195 |
Middle East, Asia and other | Reportable Geographical Components |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues from external customers | 30,252 | 40,519 | $ 19,952
Total identifiable assets | $ 5,668 | $ 25,300 |

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