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Quarterly Results (Unaudited) (Text Block) | 12 Months Ended
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Dec. 31, 2017
Quarterly Results (Unaudited) [Abstract] |
Quarterly Financial Information [Text Block] | Quarterly Results (Unaudited)
| 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.
During the fourth quarter of 2017, the Tax Act was enacted into law in the United States. We recognized provisional estimates for the impact of the Tax Act of $30.4 million to remeasure our deferred tax assets as a result of these legislative changes. This resulted in a decrease of $0.79 and $0.77 to basic and diluted earnings per share, respectively, for the three months ended December 31, 2017. During the second quarter of 2017, we recognized an insurance recovery in our Water segment associated with warranty costs recognized as a result of our 2015 product replacement notification to customers who had purchased certain communication modules. As a result, gross profit increased $8.0 million for the three months ended June 30, 2017. After adjusting for the tax impact, the recovery resulted in an increase of $0.13 and $0.12 to basic and diluted earnings per share, respectively, for the three months ended June 30, 2017. During the third quarter of 2016, we announced the 2016 Projects to restructure various company activities in order to improve operational efficiencies, reduce expenses and improve competiveness. As a result, we recognized $40.0 million and $7.8 million in restructuring costs during the third and fourth quarters of 2016, respectively, related to the 2016 Projects.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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