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Unaudited Quarterly Financial Data (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Sep. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net sales | $ 172,612 |  | $ 173,846 |  | $ 186,903 |  | $ 162,616 |  | $ 154,641 |  | $ 162,057 |  | $ 165,289 |  | $ 162,825 |  |  |  |  |  | $ 695,977 | $ 644,812 | $ 660,579
Gross profit | 47,779 |  | 49,748 |  | 52,751 |  | 45,161 |  | 42,239 |  | 45,145 |  | 45,946 |  | 43,648 |  |  |  |  |  |  |  |
Operating income (loss) | 10,170 |  | 11,780 |  | 13,626 |  | 8,506 |  | 8,327 |  | 8,947 |  | 7,415 |  | 3,126 |  |  |  |  |  | 44,082 | 27,815 | (25,823)
Provision (benefit) for income taxes | (39,503) | [1] | 919 | [1] | 1,350 | [1] | 845 | [1] | (345) |  | 32 |  | (381) |  | 147 |  |  |  |  |  | (36,389) | (547) | (1,856)
Income (loss) from continuing operations | 48,489 |  | 9,981 |  | 10,995 |  | 6,109 |  | 4,935 |  | 7,411 |  | 6,328 |  | 2,103 |  |  |  |  |  | 75,574 | 20,777 | (51,204)
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  | 16 | [2] | (113) | [2] | 55 | [2] | (168) | [2] |  |  |  |  |  | (210) | (9,387)
Net income (loss) | 48,489 |  | 9,981 |  | 10,995 |  | 6,109 |  | 4,951 |  | 7,298 |  | 6,383 |  | 1,935 |  |  |  |  |  | 75,574 | 20,567 | (60,591)
Less: income (loss) attributable to noncontrolling interest | 122 |  | (303) |  | (576) |  | (1,130) |  | (1,133) |  | (69) |  | (596) |  | (409) |  |  |  |  |  | (1,887) | (2,207) | (13,483)
Net income (loss) attributable to Stoneridge, Inc. | $ 48,367 |  | $ 10,284 |  | $ 11,571 |  | $ 7,239 |  | $ 6,084 |  | $ 7,367 |  | $ 6,979 |  | $ 2,344 |  |  |  |  |  | $ 77,461 | $ 22,774 | $ (47,108)
Earnings (loss) per share attributable to continuing operations attributable to Stoneridge, Inc.: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 1.74 | [3] | $ 0.37 | [3] | $ 0.42 | [3] | $ 0.26 | [3] | $ 0.22 | [3] | $ 0.27 | [3] | $ 0.26 | [3] | $ 0.10 | [3] |  |  |  |  | $ 2.79 | $ 0.84 | $ (1.40)
Diluted (in dollars per share) | 1.70 | [3] | 0.36 | [3] | 0.41 | [3] | 0.26 | [3] | 0.22 | [3] | 0.27 | [3] | 0.25 | [3] | 0.09 | [3] |  |  |  |  | 2.74 | 0.82 | (1.40)
Earnings (loss) per share attributable to discontinued operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  | 0.00 | [3] | (0.01) | [3] | 0.00 | [3] | (0.01) | [3] |  |  |  |  | 0.00 | (0.01) | (0.35)
Diluted (in dollars per share) |  |  |  |  |  |  |  |  | 0.00 | [3] | (0.01) | [3] | 0.00 | [3] | (0.01) | [3] |  |  |  |  | 0.00 | (0.01) | (0.35)
Earnings (loss) per share attributable to Stoneridge, Inc.: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | 1.74 | [3] | 0.37 | [3] | 0.42 | [3] | 0.26 | [3] | 0.22 | [3] | 0.26 | [3] | 0.26 | [3] | 0.09 | [3] |  |  |  |  | 2.79 | 0.83 | (1.75)
Diluted (in dollars per share) | $ 1.70 | [3] | $ 0.36 | [3] | $ 0.41 | [3] | $ 0.26 | [3] | $ 0.22 | [3] | $ 0.26 | [3] | $ 0.25 | [3] | $ 0.08 | [3] |  |  |  |  | $ 2.74 | $ 0.81 | $ (1.75)
Goodwill impairment charge (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 51,458
Goodwill impairment loss (gain) attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,142 |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (49,600) |  |
(Loss) on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (10,607)
Loss on disposal, net of tax |  |  |  |  |  |  |  |  | $ 16 |  | $ (113) |  | $ 55 |  | $ (168) |  |  |  |  |  |  | $ (210) | (8,576)
PST [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) per share attributable to Stoneridge, Inc.: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 27,960 |  | $ 29,300 | $ 23,498 |  |  | 51,458
Goodwill impairment loss (gain) attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,274) | $ 6,436 | $ 5,162 |  |  | $ 11,304
[1] | 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.
[2] | A gain (loss) on disposal of the Wiring business was recorded for the quarters ended March 31, 2015, June 30, 2015, September 30, 2015 and December 31, 2015 for $(168), $55, $(113) and $16, respectively
[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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