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Earnings per Share Data | 6 Months Ended
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Jun. 30, 2014
Earnings Per Share [Abstract] |
Earnings per Share Data | Earnings per Share Data Basic earnings per share excludes the dilutive effects of stock options, restricted stock units (RSUs), and the nil coupon non-redeemable convertible unsecured loan notes. Diluted earnings per share includes the dilutive effect of the nil coupon non-redeemable convertible unsecured loan notes, RSUs, and unexercised in-the-money stock options, except in periods of net loss where the effect of these instruments is antidilutive. Out-of-money stock options are excluded from diluted earnings per share because they are anti-dilutive. At June 30, 2014, basic earnings per share is equal to diluted earnings per share because all outstanding stock awards and convertible loan notes are considered anti-dilutive during periods of net loss. The following table sets forth the weighted-average shares used in calculating the earnings per share for the three and six- month periods ended June 30, 2014 and 2013.
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
Basic weighted-average shares |  | 22,814,000 |  |  | 22,197,000 |  |  | 22,728,000 |  |  | 22,155,000 |
Conversion of unsecured loan notes |  | — |  |  | 7,000 |  |  | — |  |  | 7,000 |
Unexercised options and unvested RSUs |  | — |  |  | 1,091,000 |  |  | — |  |  | 971,000 |
Diluted weighted-average shares |  | 22,814,000 |  |  | 23,295,000 |  |  | 22,728,000 |  |  | 23,133,000 |
Fuel Tech had 1,434,000 and 1,658,000 weighted average equity awards outstanding at June 30, 2014 and 2013, respectively, that were not dilutive for the purposes of inclusion in the calculation of diluted earnings per share but could potentially become dilutive in future periods.

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