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Industry Segment and Geographic Data, Reportable Segments (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) Segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Financial information for reportable segment [Abstract] |  |  |  |
Number of operating segments | Segment |  | 3 |  |
Net sales | [1] | $ 1,358,272 | $ 1,371,815 | $ 1,298,816
Depreciation and amortization |  | 29,022 | 28,298 | 27,243
Operating income (loss) |  | 92,677 | 104,135 | 128,999
Investment in unconsolidated affiliates |  | 24,050 | 41,745 | 44,087
Capital expenditures |  | 28,633 | 25,956 | 25,875
Total assets |  | 1,293,047 | 1,254,929 | 1,197,961
Vehicle Control [Member] | Reportable Segments [Member] |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |
Net sales | [1] | 737,932 | 750,571 | 737,431
Depreciation and amortization |  | 13,877 | 14,075 | 14,840
Operating income (loss) |  | 71,327 | 74,153 | 97,029
Investment in unconsolidated affiliates |  | 2,496 | 2,490 | 2,729
Capital expenditures |  | 13,955 | 13,378 | 17,048
Total assets |  | 620,569 | 618,789 | 604,016
Temperature Control [Member] | Reportable Segments [Member] |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |
Net sales | [1] | 337,754 | 351,237 | 324,080
Depreciation and amortization |  | 3,424 | 2,973 | 3,345
Operating income (loss) |  | 17,343 | 26,459 | 30,077
Investment in unconsolidated affiliates |  | 19,711 | 27,557 | 28,518
Capital expenditures |  | 1,899 | 3,973 | 2,130
Total assets |  | 274,657 | 254,137 | 234,771
Engineered Solutions [Member] | Reportable Segments [Member] |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |
Net sales | [1] | 282,586 | 270,007 | 237,305
Depreciation and amortization |  | 9,966 | 9,557 | 7,390
Operating income (loss) |  | 19,944 | 18,713 | 19,982
Investment in unconsolidated affiliates |  | 1,843 | 11,698 | 12,840
Capital expenditures |  | 12,095 | 6,489 | 5,354
Total assets |  | 292,080 | 289,518 | 272,791
Other [Member] |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |
Net sales | [1] | 0 | 0 | 0
Depreciation and amortization |  | 1,755 | 1,693 | 1,668
Operating income (loss) |  | (15,937) | (15,190) | (18,089)
Investment in unconsolidated affiliates |  | 0 | 0 | 0
Capital expenditures |  | 684 | 2,116 | 1,343
Total assets |  | $ 105,741 | $ 92,485 | $ 86,383
[1] | There are no intersegment sales among our Vehicle Control, Temperature Control and Engineered Solutions operating segments.

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