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NET INCOME PER SHARE | 6 Months Ended
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Jun. 30, 2018
Net income per share attributable to TTEC stockholders |
NET INCOME PER SHARE | (13)NET INCOME PER SHARE The following table sets forth the computation of basic and diluted shares for the periods indicated (in thousands):
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Shares used in basic earnings per share calculation |  | 46,016 |  | 45,662 |  | 45,944 |  | 45,805
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options |  | 9 |  | 11 |  | 9 |  | 6
Restricted stock units |  | 374 |  | 460 |  | 469 |  | 395
Performance-based restricted stock units |  | 2 |  | 17 |  | 2 |  | 18
Total effects of dilutive securities |  | 385 |  | 488 |  | 480 |  | 419
Shares used in dilutive earnings per share calculation |  | 46,401 |  | 46,150 |  | 46,424 |  | 46,224
For the three months ended June 30, 2018 and 2017, options to purchase 0.0 million and 0.0 million shares of common stock, respectively, were outstanding, but not included in the computation of diluted net income per share because the exercise price exceeded the value of the shares and the effect would have been anti-dilutive. For the six months ended June 30, 2018 and 2017, options to purchase 0.0 million and 0.0 million shares of common stock, respectively, were outstanding, but not included in the computation of diluted net income per share because the exercise price exceeded the value of the shares and the effect would have been anti-dilutive. For the three months ended June 30, 2018 and 2017, restricted stock units (“RSUs”) of 0.1 million and 0.0 million, respectively, were outstanding, but not included in the computation of diluted net income per share because the effect would have been anti-dilutive. For the six months ended June 30, 2018 and 2017, RSUs of 0.1 million and 0.0 million, respectively, were outstanding, but not included in the computation of diluted net income per share because the effect would have been anti-dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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