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NET INCOME PER SHARE (TABLES) | 12 Months Ended
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Dec. 31, 2015
NET INCOME PER SHARE [Abstract] |
Schedule of Diluted Shares Calculation | The following table sets forth the computation of basic and diluted shares for the periods indicated (in thousands):
|  |  | Year Ended December 31, |
|  |  | 2015 |  | 2014 |  | 2013 |
Shares used in basic earnings per share calculation |  |  | 48,370 |  | 49,297 |  | 51,338 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options |  |  | 275 |  | 413 |  | 417 |
Restricted stock units |  |  | 338 |  | 392 |  | 489 |
Performance-based restricted stock units |  |  | 28 |  | — |  | — |
Total effects of dilutive securities |  |  | 641 |  | 805 |  | 906 |
Shares used in dilutive earnings per share calculation |  |  | 49,011 |  | 50,102 |  | 52,244 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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