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Business Combination - Pro Forma Financial Information (Details) - Residential Control Systems, Inc - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Business Combination |  |
Net sales | $ 164,698 | $ 161,698
Net income (loss) | $ (587) | $ (139)
Basic earnings per share attributable to Universal Electronics Inc. (in dollars per share) | $ (0.04) | $ (0.01)
Diluted earnings per share attributable to Universal Electronics Inc. (in dollars per share) | $ (0.04) | $ (0.01)

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