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Unaudited Quarterly Financial Data (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 207,440 |  | $ 203,582 |  | $ 209,111 |  | $ 204,311 |  | $ 172,612 |  | $ 173,846 |  | $ 186,903 |  | $ 162,616 |  | $ 824,444 | $ 695,977 | $ 644,812
Gross profit | 61,026 |  | 62,549 |  | 63,414 |  | 61,151 |  | 47,779 |  | 49,748 |  | 52,751 |  | 45,161 |  |  |  |
Operating income (loss) | 13,234 |  | 13,296 |  | 15,676 |  | 15,164 |  | 10,170 |  | 11,780 |  | 13,626 |  | 8,506 |  | 57,370 | 44,082 | 27,815
Provision (benefit) for income taxes | (6,036) | [1] | 3,809 | [1] | 5,189 | [1] | 4,571 | [1] | (39,503) | [2] | 919 | [2] | 1,350 | [2] | 845 | [2] | 7,533 | (36,389) | (547)
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,049 | 75,574 | 20,777
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (210)
Net income (loss) | 18,908 |  | 8,049 |  | 8,919 |  | 9,173 |  | 48,489 |  | 9,981 |  | 10,995 |  | 6,109 |  | 45,049 | 75,574 | 20,567
Less: income (loss) attributable to noncontrolling interest |  |  |  |  | (100) |  | (30) |  | 122 |  | (303) |  | (576) |  | (1,130) |  | (130) | (1,887) | (2,207)
Net income (loss) attributable to Stoneridge, Inc. | $ 18,908 |  | $ 8,049 |  | $ 9,019 |  | $ 9,203 |  | $ 48,367 |  | $ 10,284 |  | $ 11,571 |  | $ 7,239 |  | $ 45,179 | $ 77,461 | $ 22,774
Earnings (loss) per share attributable to continuing operations attributable to Stoneridge, Inc.: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.61 | $ 2.79 | $ 0.84
Diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.57 | 2.74 | 0.82
Earnings (loss) per share attributable to discontinued operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00 | 0.00 | (0.01)
Diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00 | 0.00 | (0.01)
Earnings (loss) per share attributable to Stoneridge, Inc.: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.67 | [3] | $ 0.29 | [3] | $ 0.32 | [3] | $ 0.33 | [3] | $ 1.74 | [3] | $ 0.37 | [3] | $ 0.42 | [3] | $ 0.26 | [3] | 1.61 | 2.79 | 0.83
Diluted (in dollars per share) | $ 0.65 | [3] | $ 0.28 | [3] | $ 0.32 | [3] | $ 0.32 | [3] | $ 1.70 | [3] | $ 0.36 | [3] | $ 0.41 | [3] | $ 0.26 | [3] | $ 1.57 | $ 2.74 | $ 0.81
[1] | The impact of the Tax Legislation was an increase in tax expense of $6.2 million due to the one-time deemed repatriation tax, offset by the favorable impacts of the reduced tax rate on the Company's net deferred tax liabilities and other deferred tax adjustments of $(15.3) million related to certain earnings included in the one-time transition tax.
[2] | The Company recorded the release of a valuation allowance associated with its U.S. federal, certain state and foreign deferred tax assets for the year ended December 31, 2016.
[3] | Earnings per share for the year may not equal the sum of the four historical quarters earnings per share due to changes in weighted-average basic and diluted shares outstanding.

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