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Industry Segment and Geographic Data, Reportable Segments (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) Segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Financial information for reportable segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable operating segments | Segment |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Net sales |  | $ 241,252 | $ 307,723 | $ 305,172 | $ 283,766 | $ 246,970 | $ 296,619 | $ 286,636 | $ 261,826 | $ 1,137,913 | [1],[2] | $ 1,092,051 | [1],[2] | $ 1,116,143 | [1],[2],[3],[4]
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 25,809 |  | 24,104 |  | 23,916 |
Operating income (loss) |  |  |  |  |  |  |  |  |  | 94,495 |  | 81,268 |  | 97,521 |
Investment in unconsolidated affiliates |  | 38,858 |  |  |  | 32,469 |  |  |  | 38,858 |  | 32,469 |  | 31,184 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 16,185 |  | 20,141 |  | 24,442 |
Total assets |  | 912,730 |  |  |  | 843,132 |  |  |  | 912,730 |  | 843,132 |  | 787,567 |
Intersegment Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | [2] |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 | [3]
Engine Management [Member] | Reportable Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | [2] |  |  |  |  |  |  |  |  | 849,161 |  | 803,487 |  | 829,413 | [3]
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 19,463 |  | 17,858 |  | 17,981 |
Operating income (loss) |  |  |  |  |  |  |  |  |  | 103,808 |  | 84,844 |  | 97,403 |
Investment in unconsolidated affiliates |  | 2,243 |  |  |  | 2,158 |  |  |  | 2,243 |  | 2,158 |  | 4,162 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 12,593 |  | 11,435 |  | 17,750 |
Total assets |  | 601,637 |  |  |  | 553,480 |  |  |  | 601,637 |  | 553,480 |  | 527,200 |
Engine Management [Member] | Intersegment Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | [2] |  |  |  |  |  |  |  |  | 19,569 |  | 23,367 |  | 24,995 | [3]
Temperature Control [Member] | Reportable Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | [2] |  |  |  |  |  |  |  |  | 278,355 |  | 278,456 |  | 279,127 | [3]
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 4,568 |  | 4,704 |  | 4,373 |
Operating income (loss) |  |  |  |  |  |  |  |  |  | 13,667 |  | 14,586 |  | 19,609 |
Investment in unconsolidated affiliates |  | 36,615 |  |  |  | 30,311 |  |  |  | 36,615 |  | 30,311 |  | 27,022 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 2,273 |  | 7,245 |  | 5,151 |
Total assets |  | 218,783 |  |  |  | 205,039 |  |  |  | 218,783 |  | 205,039 |  | 177,006 |
Temperature Control [Member] | Intersegment Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | [2] |  |  |  |  |  |  |  |  | 6,545 |  | 8,160 |  | 7,334 | [3]
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | [2] |  |  |  |  |  |  |  |  | 10,397 |  | 10,108 |  | 7,603 | [3]
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 1,778 |  | 1,542 |  | 1,562 |
Operating income (loss) |  |  |  |  |  |  |  |  |  | (22,980) |  | (18,162) |  | (19,491) |
Investment in unconsolidated affiliates |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  | 0 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,319 |  | 1,461 |  | 1,541 |
Total assets |  | $ 92,310 |  |  |  | $ 84,613 |  |  |  | 92,310 |  | 84,613 |  | 83,361 |
Other [Member] | Intersegment Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial information for reportable segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | [2] |  |  |  |  |  |  |  |  | $ (26,114) |  | $ (31,527) |  | $ (32,329) | [3]
[1] | Revenues are attributed to countries based upon the location of the customer.
[2] | Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.
[3] | Net sales and intersegment sales for 2017 have not been restated and are reported under accounting standards in effect in the period presented, as we adopted ASU 2014-09, Revenue from Contracts with Customers, on January 1, 2018 using the modified retrospective method.
[4] | Revenues for 2017 have not been restated and are reported under accounting standards in effect in the period presented, as we adopted ASU 2014-09, Revenue from Contracts with Customers, on January 1, 2018 using the modified retrospective method.

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