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Industry Segment and Geographic Data, Reportable Segments (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) Segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Financial information for reportable segment [Abstract] |  |  |  |
Number of reportable operating segments | Segment |  | 2 |  |
Net sales | [1] | $ 1,298,816 | $ 1,128,588 | $ 1,137,913
Depreciation and amortization |  | 27,243 | 26,323 | 25,809
Operating income (loss) |  | 128,999 | 108,895 | 94,495
Investment in unconsolidated affiliates |  | 44,087 | 40,507 | 38,858
Capital expenditures |  | 25,875 | 17,820 | 16,185
Total assets |  | 1,197,961 | 956,540 | 903,854
Intersegment Revenues [Member] |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |
Net sales | [1] | 0 | 0 | 0
Engine Management [Member] | Reportable Segments [Member] |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |
Net sales | [1] | 937,936 | 835,685 | 849,161
Depreciation and amortization |  | 21,881 | 20,417 | 19,463
Operating income (loss) |  | 117,367 | 111,217 | 103,808
Investment in unconsolidated affiliates |  | 2,729 | 2,428 | 2,243
Capital expenditures |  | 21,922 | 13,496 | 12,593
Total assets |  | 845,767 | 618,210 | 594,953
Engine Management [Member] | Intersegment Revenues [Member] |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |
Net sales | [1] | 23,599 | 15,952 | 19,569
Temperature Control [Member] | Reportable Segments [Member] |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |
Net sales | [1] | 348,423 | 281,954 | 278,355
Depreciation and amortization |  | 3,626 | 4,035 | 4,568
Operating income (loss) |  | 36,997 | 21,296 | 13,667
Investment in unconsolidated affiliates |  | 41,358 | 38,079 | 36,615
Capital expenditures |  | 2,586 | 1,988 | 2,273
Total assets |  | 257,114 | 230,111 | 216,591
Temperature Control [Member] | Intersegment Revenues [Member] |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |
Net sales | [1] | 9,024 | 6,162 | 6,545
Other [Member] |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |
Net sales | [1] | 12,457 | 10,949 | 10,397
Depreciation and amortization |  | 1,736 | 1,871 | 1,778
Operating income (loss) |  | (25,365) | (23,618) | (22,980)
Investment in unconsolidated affiliates |  | 0 | 0 | 0
Capital expenditures |  | 1,367 | 2,336 | 1,319
Total assets |  | 95,080 | 108,219 | 92,310
Other [Member] | Intersegment Revenues [Member] |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |
Net sales | [1] | $ (32,623) | $ (22,114) | $ (26,114)
[1] | Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.

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