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Other Non-Operating Income (Expense), Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other Non-Operating Income (Expense), Net [Abstract] |  |  |  |  |  |  |
Interest and dividend income |  |  | $ 97 | $ 80 |  | $ 91 |
Equity income (loss) from joint ventures |  |  | 2,865 | (768) | [1] | (602) | [1]
Gain (loss) on foreign exchange |  |  | (502) | (120) |  | 950 |
Postretirement plan net periodic benefit credit (cost) |  |  | 25 | 262 |  | 653 |
Other non-operating income, net |  |  | 102 | 135 |  | 158 |
Total other non-operating income (expense), net |  |  | $ 2,587 | (411) |  | 1,250 |
Orange Electronic Co., Ltd [Member] |  |  |  |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |  |  |  |
Impairment charges | $ 1,700 | $ 1,800 |  | $ 1,700 |  | $ 1,800 |
[1] | Year ended December 31, 2018 and 2017 includes a noncash impairment charge of approximately $1.7 million and $1.8 million, respectively, related to our minority interest investment in Orange Electronic Co., Ltd. (See Note 10, “Investments in Unconsolidated Affiliates” for additional information).

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