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NET INCOME PER SHARE | 12 Months Ended
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Dec. 31, 2017
Net income per share attributable to TeleTech stockholders |
NET INCOME PER SHARE | (18)NET INCOME PER SHARE The following table sets forth the computation of basic and diluted shares for the periods indicated (in thousands):
|  |  | Year Ended December 31, |
|  |  | 2017 |  | 2016 |  | 2015 |
Shares used in basic earnings per share calculation |  |  | 45,826 |  | 47,423 |  | 48,370 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options |  |  | 10 |  | 10 |  | 275 |
Restricted stock units |  |  | 536 |  | 286 |  | 338 |
Performance-based restricted stock units |  |  | 10 |  | 17 |  | 28 |
Total effects of dilutive securities |  |  | 556 |  | 313 |  | 641 |
Shares used in dilutive earnings per share calculation |  |  | 46,382 |  | 47,736 |  | 49,011 |
For the years ended December 31, 2017, 2016 and 2015, zero, 0.1 million and 0.1 million, respectively, of 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 years ended December 31, 2017, 2016 and 2015, restricted stock units of 0.0 million, 0.1 million, and 0.4 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 years ended December 31, 2017, 2016 and 2015, there were no performance-based restricted stock units outstanding but not included in the computation of diluted net income per share.

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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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