Stock-Based Compensation Stock-Based Compensation (Tables)
| 9 Months Ended |
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Sep. 30, 2011 |
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| Stock Based Compensation [Abstract] [Abstract] | |
| Stock-Based Compensation Expense and Related Tax Benefit [Table Text Block] | For the three and nine months ended September 30, stock-based compensation expense and the related tax benefit were as follows: | | | | | | | | | | | | | | | | | | Three Months Ended September 30, | | Nine Months Ended September 30, | | 2011 | | 2010 | | 2011 | | 2010 | | (in thousands) | Stock options | $ | (320 | ) | | $ | 843 |
| | $ | 1,224 |
| | $ | 3,138 |
| Restricted stock units | 2,916 |
| | 3,962 |
| | 10,320 |
| | 10,344 |
| Unrestricted stock awards | 140 |
| | 175 |
| | 330 |
| | 364 |
| ESPP | 147 |
| | 121 |
| | 527 |
| | 376 |
| Total stock-based compensation | $ | 2,883 |
| | $ | 5,101 |
| | $ | 12,401 |
| | $ | 14,222 |
| | | | | | | | | Related tax benefit | $ | 700 |
| | $ | 1,421 |
| | $ | 3,359 |
| | $ | 4,153 |
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| 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: | | | | | | | | | | | | | | Three Months Ended September 30, | | Nine Months Ended September 30, | | 2011 | | 2010(1) | | 2011 | | 2010 | Dividend yield | — |
| | — |
| | — |
| | — |
| Expected volatility | 45.8 | % | | — |
| | 46.4 | % | | 48.7 | % | Risk-free interest rate | 0.9 | % | | — |
| | 1.7 | % | | 2.3 | % | Expected life (years) | 4.91 |
| | — |
| | 4.86 |
| | 4.60 |
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(1) There were no employee stock options granted for the three months ended September 30, 2010. |
| Employee Stock Options Activity [Table Text Block] | A summary of our stock option activity for the nine months ended September 30 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, 2010 | 1,179 |
| | $ | 52.93 |
| | 5.90 |
| | $ | 22,863 |
| | | Granted | 71 |
| | 61.97 |
| | | | | | $ | 27.18 |
| Exercised | (144 | ) | | 40.82 |
| | | | $ | 4,413 |
| | | Outstanding, September 30, 2010 | 1,106 |
| | $ | 55.11 |
| | 5.83 |
| | $ | 14,660 |
| | | | | | | | | | | | | Exercisable and expected to vest, September 30, 2010 | 1,096 |
| | $ | 54.99 |
| | 5.80 |
| | $ | 14,449 |
| | | | | | | | | | | | | Exercisable, September 30, 2010 | 952 |
| | $ | 52.25 |
| | 5.40 |
| | $ | 14,551 |
| | | | | | | | | | | | | Outstanding, January 1, 2011 | 1,102 |
| | $ | 55.21 |
| | 5.58 |
| | $ | 10,883 |
| | | Granted | 103 |
| | 52.13 |
| | | | | | $ | 21.81 |
| Exercised | (29 | ) | | 19.53 |
| | | | $ | 1,050 |
| | | Forfeited | (63 | ) | | 58.50 |
| | | | | | | Expired | (1 | ) | | 7.00 |
| | | | | | | Outstanding, September 30, 2011 | 1,112 |
| | $ | 55.72 |
| | 4.68 |
| | $ | 1,518 |
| | | | | | | | | | | | | Exercisable and expected to vest, September 30, 2011 | 1,106 |
| | $ | 55.74 |
| | 4.65 |
| | $ | 1,518 |
| | | | | | | | | | | | | Exercisable, September 30, 2011 | 1,027 |
| | $ | 55.94 |
| | 4.30 |
| | $ | 1,518 |
| | |
| | (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. |
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| Restricted Stock Units Award Activity [Table Text Block] | The following table summarizes restricted stock unit activity for the nine months ended September 30:
| | | | | | | | | | | | | Number of Restricted Stock Units | | Weighted Average Grant Date Fair Value | | Aggregate Intrinsic Value(1) | | (in thousands) | | | | (in thousands) | Outstanding, January 1, 2010 | 326 |
| | | | | Granted(2) | 215 |
| | $ | 63.42 |
| | | Released | (78 | ) | | | | $ | 5,216 |
| Forfeited | (14 | ) | | | | | Outstanding, September 30, 2010 | 449 |
| | | | | | | | | | | Outstanding, January 1, 2011 | 588 |
| | | | | Granted(2) | 286 |
| | $ | 54.82 |
| | | Released | (201 | ) | | | | $ | 15,739 |
| Forfeited | (37 | ) | | | | | Outstanding, September 30, 2011 | 636 |
| | | | | | | | | | | Expected to vest, September 30, 2011 | 544 |
| | | | $ | 16,040 |
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| | (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) | These restricted stock units do not include the respective 2010 and 2011 awards under the Performance Award Agreement, which are not eligible for vesting as of September 30 of each respective year. |
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| Nonrestricted Stock Awards Activity [Table Text Block] | The following table summarizes unrestricted stock award activity for the three and nine months ended September 30: | | | | | | | | | | | | | | | | | | Three Months Ended September 30, | | Nine Months Ended September 30, | | 2011 | | 2010 | | 2011 | | 2010 | Shares of unrestricted stock issued | 2,864 |
| | 2,896 |
| | 6,317 |
| | 5,662 |
| | | | | | | | | Weighted average grant date fair value | $ | 48.84 |
| | $ | 60.39 |
| | $ | 52.19 |
| | $ | 64.35 |
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| Employee Stock Purchase Plan (ESPP) Activity [Table Text Block] | The following table summarizes ESPP activity for the three and nine months ended September 30:
| | | | | | | | | | | | | | | | | | Three Months Ended September 30, | | Nine Months Ended September 30, | | 2011 | | 2010 | | 2011 | | 2010 | Shares of stock sold to employees(1) | 22,518 |
| | 14,819 |
| | 65,143 |
| | 37,905 |
| | | | | | | | | Weighted average fair value per ESPP award(2) | $ | 4.43 |
| | $ | 9.16 |
| | $ | 5.56 |
| | $ | 9.69 |
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| | (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. |
| | (2) | Relating to awards associated with the offering period during the three and nine months ended September 30. |
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