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Business Combinations Business Combinations (Tables) | 12 Months Ended
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Dec. 31, 2017
Business Acquisition [Line Items] |
Schedule of Business Acquisitions, by Acquisition [Table Text Block] | The following reflects our final allocation of purchase price as of June 1, 2017:
| Fair Value |  | Weighted Average Useful Life
| (in thousands) |  | (in years)
Current assets | $ | 15,118 |  |  |
Property, plant, and equipment | 2,275 |  |  |
Other long-term assets | 1,879 |  |  |
Identified intangible assets |  |  |
Core-developed technology | 19,250 |  |  | 8
Customer contracts and relationships | 12,230 |  |  | 10
Trademarks and trade names | 4,310 |  |  | 15
Total identified intangible assets subject to amortization | 35,790 |  |  |
In-process research and development (IPR&D) | 710 |  |  |
Total identified intangible assets | 36,500 |  |  |
Goodwill | 59,675 |  |  |
Current liabilities | (10,787 | ) |  |
Long-term liabilities | (4,645 | ) |  |
Total net assets acquired | $ | 100,015 |  |  |
Schedule Of Revenues and Earnings Attributable to an Acquired Business [Table Text Block] | The following table presents the revenues and net income (loss) from Comverge's operations that are included in our Consolidated Statements of Operations:
| June 1, 2017 - December 31, 2017
Revenues | $ | 32,436 |
Net income (loss) | (2,448 | )
Business Acquisition, Pro Forma Information [Table Text Block] | The following supplemental pro forma results are based on the individual historical results of Itron and Comverge, with adjustments to give effect to the combined operations as if the acquisition had been consummated on January 1, 2016.
| Year Ended December 31,
| 2017 |  | 2016
Revenues | $ | 2,040,309 |  |  | $ | 2,072,695 |
Net income | 64,230 |  |  | 24,415 |

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