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NET INCOME PER SHARE | 9 Months Ended
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Sep. 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 September 30, |  | Nine Months Ended September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Shares used in basic earnings per share calculation |  | 46,172 |  | 45,838 |  | 46,021 |  | 45,816
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options |  | 6 |  | 10 |  | 8 |  | 9
Restricted stock units |  | 138 |  | 517 |  | 360 |  | 513
Performance-based restricted stock units |  | — |  | 2 |  | 1 |  | 10
Total effects of dilutive securities |  | 144 |  | 529 |  | 369 |  | 532
Shares used in dilutive earnings per share calculation |  | 46,316 |  | 46,367 |  | 46,390 |  | 46,348
For the three months ended September 30, 2018 and 2017, no options to purchase shares of common stock 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 nine months ended September 30, 2018 and 2017, no options and 30 thousand options to purchase 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 September 30, 2018 and 2017, restricted stock units (“RSUs”) of 475 thousand and two thousand, 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 nine months ended September 30, 2018 and 2017, RSUs of 168 thousand and 16 thousand, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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