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Unaudited Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] | The following is a summary of quarterly results of operations:
|  | Quarter ended |
|  | December 31 |  |  | September 30 |  |  | June 30 |  |  | March 31 |
2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 222,725 |  |  | $ | 219,256 |  |  | $ | 234,265 |  |  | $ | 262,267 |
Gross profit |  |  | 54,609 |  |  |  | 51,238 |  |  |  | 53,659 |  |  |  | 65,138 |
Operating income |  |  | 8,648 |  |  |  | 6,615 |  |  |  | 1,617 |  |  |  | 11,849 |
Provision (benefit) for income taxes |  |  | 95 |  |  |  | 383 |  |  |  | (884 | ) |  |  | 1,218 |
Net income (loss) |  |  | 2,711 |  |  |  | 589 |  |  |  | (5,298 | ) |  |  | 5,746 |
Net income (loss) attributable to noncontrolling interests |  |  | 90 |  |  |  | 170 |  |  |  | (1,740 | ) |  |  | (133 | )
Net income (loss) attributable to Stoneridge, Inc. |  |  | 2,621 |  |  |  | 419 |  |  |  | (3,558 | ) |  |  | 5,879 |
Earnings per share attributable to Stoneridge, Inc.: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (A) |  |  | 0.10 |  |  |  | 0.02 |  |  |  | (0.13 | ) |  |  | 0.22 |
Diluted (A) |  |  | 0.10 |  |  |  | 0.02 |  |  |  | (0.13 | ) |  |  | 0.22 |
|  | Quarter ended |
|  | December 31 |  |  | September 30 |  |  | June 30 |  |  | March 31 |
2011 |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 186,048 |  |  | $ | 195,864 |  |  | $ | 190,417 |  |  | $ | 193,044 |
Gross profit |  |  | 32,318 |  |  |  | 37,451 |  |  |  | 37,718 |  |  |  | 39,290 |
Operating income (loss) |  |  | (7,584 | ) |  |  | 6,997 |  |  |  | 7,413 |  |  |  | 6,700 |
Provision for income taxes |  |  | 22,727 |  |  |  | 1,543 |  |  |  | 1,158 |  |  |  | 677 |
Net income (B) |  |  | 35,366 |  |  |  | 4,257 |  |  |  | 3,240 |  |  |  | 2,674 |
Net loss attributable to noncontrolling interests |  |  | (3,209 | ) |  |  | (272 | ) |  |  | (124 | ) |  |  | (215 | )
Net income attributable to Stoneridge, Inc. |  |  | 38,575 |  |  |  | 4,529 |  |  |  | 3,364 |  |  |  | 2,889 |
Earnings per share attributable to Stoneridge, Inc.: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (A) |  |  | 1.58 |  |  |  | 0.19 |  |  |  | 0.14 |  |  |  | 0.12 |
Diluted (A) |  |  | 1.56 |  |  |  | 0.18 |  |  |  | 0.14 |  |  |  | 0.12 |
| (A) | 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.
| (B) | As a result of obtaining a controlling interest in PST on December 31, 2011, the Company recognized a one-time non-cash after-tax gain of $42.5 million.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 + Details
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