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Quarterly Results (Unaudited) Quarterly Results (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Results (Unaudited) [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] |
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total Year
| (in thousands, except per share data)
2017 |  |  |  |  |  |  |  |  |
Statement of operations data (unaudited): |  |  |  |  |  |  |  |  |
Revenues | $ | 477,592 |  |  | $ | 503,082 |  |  | $ | 486,747 |  |  | $ | 550,776 |  |  | $ | 2,018,197 |
Gross profit | 157,225 |  |  | 177,860 |  |  | 165,318 |  |  | 174,751 |  |  | 675,154 |
Net income attributable to Itron, Inc. | 15,845 |  |  | 14,097 |  |  | 25,576 |  |  | 1,780 |  |  | 57,298 |
Earnings per common share - Basic(1) | $ | 0.41 |  |  | $ | 0.36 |  |  | $ | 0.66 |  |  | $ | 0.05 |  |  | $ | 1.48 |
Earnings per common share - Diluted(1) | $ | 0.40 |  |  | $ | 0.36 |  |  | $ | 0.65 |  |  | $ | 0.05 |  |  | $ | 1.45 |
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total Year
| (in thousands, except per share data)
2016 |  |  |  |  |  |  |  |  |
Statement of operations data (unaudited): |  |  |  |  |  |  |  |  |
Revenues | $ | 497,590 |  |  | $ | 513,024 |  |  | $ | 506,859 |  |  | $ | 495,713 |  |  | $ | 2,013,186 |
Gross profit | 163,203 |  |  | 169,705 |  |  | 170,749 |  |  | 156,663 |  |  | 660,320 |
Net income (loss) attributable to Itron, Inc. | 10,089 |  |  | 19,917 |  |  | (9,885 | ) |  | 11,649 |  |  | 31,770 |
Earnings (loss) per common share - Basic(1) | $ | 0.27 |  |  | $ | 0.52 |  |  | $ | (0.26 | ) |  | $ | 0.30 |  |  | $ | 0.83 |
Earnings (loss) per common share - Diluted(1) | $ | 0.26 |  |  | $ | 0.52 |  |  | $ | (0.26 | ) |  | $ | 0.30 |  |  | $ | 0.82 |
(1) | The sum of the quarterly EPS data presented in the table may not equal the annual results due to rounding and the impact of dilutive securities on the annual versus the quarterly EPS calculations.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, 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=84173487&loc=d3e1280-108306 + Details
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