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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Share-based Compensation [Abstract] |
Stock-Based Compensation Expense and Related Tax Benefit [Table Text Block] | For the years ended December 31, stock-based compensation expense and the related tax benefit were as follows:
| 2016 |  | 2015 |  | 2014
| (in thousands)
Stock options | $ | 2,357 |  |  | $ | 2,648 |  |  | $ | 2,333 |
Restricted stock units | 14,723 |  |  | 10,735 |  |  | 14,591 |
Unrestricted stock awards | 955 |  |  | 706 |  |  | 936 |
Phantom stock units | 1,077 |  |  | — |  |  | — |
Total stock-based compensation | $ | 19,112 |  |  | $ | 14,089 |  |  | $ | 17,860 |
Related tax benefit | $ | 4,927 |  |  | $ | 4,228 |  |  | $ | 4,994 |
Stock Options, Valuation Assumptions [Table Text Block] | The fair values of stock options granted were estimated at the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
Dividend yield | — |  |  | — |  |  | — |
Expected volatility | 33.5 | % |  | 34.3 | % |  | 39.3 | %
Risk-free interest rate | 1.3 | % |  | 1.7 | % |  | 1.7 | %
Expected term (years) | 5.5 |  |  | 5.5 |  |  | 5.5 |
Employee Stock Options Activity [Table Text Block] | A summary of our stock option activity for the years ended December 31 is as follows:
| Shares |  | Weighted Average Exercise Price per Share |  | Weighted Average Remaining Contractual Life |  | Aggregate Intrinsic Value(1) |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |  |  | (years) |  | (in thousands) |  |
Outstanding, January 1, 2014 | 1,180 |  |  | $ | 54.79 |  |  | 4.6 |  | $ | 1,300 |  |  |
Granted | 160 |  |  | 35.65 |  |  |  |  |  |  | $ | 13.65 |
Exercised | (67 | ) |  | 28.03 |  |  |  |  | 826 |  |  |
Forfeited | (7 | ) |  | 44.06 |  |  |  |  |  |  |
Expired | (143 | ) |  | 68.97 |  |  |  |  |  |  |
Outstanding, December 31, 2014 | 1,123 |  |  | $ | 51.90 |  |  | 4.4 |  | $ | 1,676 |  |  |
Granted | 291 |  |  | $ | 35.25 |  |  |  |  |  |  | $ | 12.09 |
Exercised | (24 | ) |  | 36.05 |  |  |  |  | $ | 26 |  |  |
Forfeited | (17 | ) |  | 37.47 |  |  |  |  |  |  |
Expired | (193 | ) |  | 52.17 |  |  |  |  |  |  |
Outstanding, December 31, 2015 | 1,180 |  |  | $ | 48.31 |  |  | 5.7 |  | $ | 405 |  |  |
Granted | 191 |  |  | $ | 40.40 |  |  |  |  |  |  | $ | 13.27 |
Exercised | (58 | ) |  | 37.00 |  |  |  |  | $ | 742 |  |  |
Forfeited | (36 | ) |  | 35.29 |  |  |  |  |  |  |
Expired | (318 | ) |  | 55.13 |  |  |  |  |  |  |
Outstanding, December 31, 2016 | 959 |  |  | $ | 45.64 |  |  | 6.6 |  | $ | 19,125 |  |  |
Exercisable, December 31, 2016 | 562 |  |  | $ | 51.18 |  |  | 5.1 |  | $ | 9,181 |  |  |
Expected to vest, December 31, 2016 | 385 |  |  | $ | 37.76 |  |  | 8.7 |  | $ | 9,658 |  |  |
(1) | The aggregate intrinsic value of outstanding stock options represents amounts that would have been received by the optionees had all in- the-money options been exercised on that date. Specifically, it is the amount by which the market value of Itron’s stock exceeded the exercise price of the outstanding in-the-money options before applicable income taxes, based on our closing stock price on the last business day of the period. The aggregate intrinsic value of stock options exercised during the period is calculated based on our stock price at the date of exercise.
Schedule of Share-based Payment Award, Restricted Stock Units, Valuation Assumptions [Table Text Block] | The weighted-average assumptions used to estimate the fair value of performance-based restricted stock units granted and the resulting weighted average fair-value are as follows:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
Dividend yield | — |  |  | — |  |  | — |
Expected volatility | 30.0 | % |  | 30.1 | % |  | 32.3 | %
Risk-free interest rate | 0.7 | % |  | 0.7 | % |  | 0.4 | %
Expected term (years) | 1.8 |  |  | 2.1 |  |  | 2.0 |
Weighted-average grant date fair value | $ | 44.92 |  |  | $ | 33.48 |  |  | $ | 35.15 |
Restricted Stock Units Award Activity [Table Text Block] | The following table summarizes restricted stock unit activity for the years ended December 31:
| Number of Restricted Stock Units |  | Weighted Average Grant Date Fair Value |  | Aggregate Intrinsic Value(1)
| (in thousands) |  |  |  | (in thousands)
Outstanding, January 1, 2014 | 658 |  |  |  |  |
Granted(2) | 350 |  |  | $ | 35.74 |  |  |
Released | (291 | ) |  |  |  | $ | 14,402 |
Forfeited | (35 | ) |  |  |  |
Outstanding, December 31, 2014 | 682 |  |  |  |  |
Granted(3) | 434 |  |  | $ | 35.09 |  |  |
Released | (296 | ) |  |  |  | $ | 12,204 |
Forfeited | (64 | ) |  |  |  |
Outstanding, December 31, 2015 | 756 |  |  |  |  |
Granted (4) | 306 |  |  | $ | 41.58 |  |  |
Released | (312 | ) |  |  |  | $ | 11,944 |
Forfeited | (82 | ) |  |  |  |
Outstanding, December 31, 2016 | 668 |  |  |  |  |
Vested but not released, December 31, 2016 | 115 |  |  |  |  | $ | 7,242 |
Expected to vest, December 31, 2016 | 477 |  |  |  |  | $ | 30,006 |
(1) | The aggregate intrinsic value is the market value of the stock, before applicable income taxes, based on the closing price on the stock release dates or at the end of the period for restricted stock units expected to vest.
(2) | Restricted stock units include 14,433 shares for the 2-year award under the 2013 Performance Award Agreement, which are eligible for distribution at December 31, 2014.
(3) | Restricted stock units include 15,648 shares for the 3-year award under the 2013 Performance Award Agreement, which are eligible for distribution at December 31, 2015.
(4) | Restricted stock units include 110,259 shares for the 3-year award under the 2014 Performance Award Agreement, which are eligible for distribution at December 31, 2016.
Unrestricted Stock Awards Activity [Table Text Block] | The following table summarizes unrestricted stock award activity for the years ended December 31:
| 2016 |  | 2015 |  | 2014
| (in thousands, except per share data)
Shares of unrestricted stock granted | 21 |  |  | 20 |  |  | 24 |
Weighted average grant date fair value per share | $ | 44.94 |  |  | $ | 35.01 |  |  | $ | 39.06 |
Schedule of Other Share-based Compensation, Activity [Table Text Block] | The following table summarizes phantom stock unit activity:
| Number of Phantom Stock Units |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |
Outstanding, January 1, 2016 | — |  |  |
Granted | 63 |  |  | $ | 40.11 |
Forfeited | (1 | ) |  |
Outstanding, December 31, 2016 | 62 |  |  |
Expected to vest, December 31, 2016 | 57 |  |  |
Employee Stock Purchase Plan (ESPP) Activity [Table Text Block] | The following table summarizes ESPP activity for the years ended December 31:
| 2016 |  | 2015 |  | 2014
| (in thousands)
Shares of stock sold to employees(1) | 20 |  |  | 54 |  |  | 61 |
(1) | Stock sold to employees during each fiscal quarter under the ESPP is associated with the offering period ending on the last day of the previous fiscal quarter.

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of restricted stock units, including, but not limited to: (a) expected term of stock units, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock awards granted to nonemployee directors that were outstanding at the beginning and end of the year, and the number of awards that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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