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Business Acquisitions and Investments (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2019 | Apr. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Aug. 31, 2019 | Mar. 31, 2018 | Apr. 30, 2014
Allocation of the Purchase Price, Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | [1] |  |  | $ 307,723 | $ 296,619 | $ 896,661 | $ 845,081 |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 77,664 |  | $ 77,664 |  | $ 67,321 |  |  |
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest acquired in joint venture |  |  |  | 65.00% |  | 65.00% |  |  |  | 15.00% | 50.00%
Investment in unconsolidated affiliates |  |  |  |  |  |  |  |  |  | $ 4,200 | $ 14,000
Pollak business of Stoneridge, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Allocation of the Purchase Price, Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Acquisition of assets and liabilities |  |  | $ 40,000 |  |  |  |  |  |  |  |
Post-closing adjustments amount |  | $ 1,600 |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  | $ 45,000 |  |  |
Purchase Price |  |  | 38,427 |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Inventory |  |  | 3,331 |  |  |  |  |  |  |  |
Property, plant and equipment, net |  |  | 45 |  |  |  |  |  |  |  |
Intangible assets |  |  | 24,650 |  |  |  |  |  |  |  |
Goodwill |  |  | 10,401 |  |  |  |  |  |  |  |
Net assets acquired |  |  | 38,427 |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  |  |  |  | 15 years |  |  |  |  |
Revenues |  |  |  | $ 20,000 |  |  |  |  |  |  |
Pollak business of Stoneridge, Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  | 7,200 |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  |  |  |  | 15 years |  |  |  |  |
Pollak business of Stoneridge, Inc. [Member] | Trademarks [Member] |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  | 200 |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  |  |  |  | 10 years |  |  |  |  |
Pollak business of Stoneridge, Inc. [Member] | Non-Compete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  | 100 |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  |  |  |  | 5 years |  |  |  |  |
Pollak business of Stoneridge, Inc. [Member] | OE/OES [Member] |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  |  |  |  | 10 years |  |  |  |  |
Pollak business of Stoneridge, Inc. [Member] | OE/OES [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  | $ 17,200 |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  |  |  |  | 10 years |  |  |  |  |
Jiangsu Che Yijia New Energy Technology Co., Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest acquired in joint venture |  |  |  |  |  |  |  |  | 29.00% |  |
Investment in unconsolidated affiliates |  |  |  |  |  |  |  |  | $ 5,100 |  |
[1] | Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.

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