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EARNINGS PER SHARE | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
EARNINGS PER SHARE | EARNINGS PER SHARE: Basic earnings per share are calculated by dividing net income by the weighted-average shares of common stock outstanding during the period. Diluted earnings per share are calculated by dividing net income by the weighted-average shares of common stock and dilutive common equivalent shares outstanding during the period. Dilutive common equivalent shares included in this calculation consist of dilutive shares issuable upon the assumed exercise of outstanding common stock options, the assumed vesting of outstanding restricted stock units, the assumed issuance of awards under the stock purchase plan and contingently issuable performance based awards, as computed using the treasury stock method. A summary of the earnings per share calculation is as follows:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(In thousands, except per share amounts) | 2017 |  | 2016 |  | 2017 |  | 2016
Basic earnings per share: |  |  |  |  |  |  |
Net income | $ | 13,902 |  |  | $ | 11,407 |  |  | $ | 28,001 |  |  | $ | 21,786 |
Weighted-average common shares | 29,720 |  |  | 28,850 |  |  | 29,589 |  |  | 28,765 |
Basic earnings per share | $ | 0.47 |  |  | $ | 0.40 |  |  | $ | 0.95 |  |  | $ | 0.76 |
Diluted earnings per share: (1) |  |  |  |  |  |  |
Net income | $ | 13,902 |  |  | $ | 11,407 |  |  | $ | 28,001 |  |  | $ | 21,786 |
Weighted-average common shares | 29,720 |  |  | 28,850 |  |  | 29,589 |  |  | 28,765 |
Effect of dilutive awards: |  |  |  |  |  |  |
Employee stock plans | 734 |  |  | 572 |  |  | 781 |  |  | 596 |
Diluted weighted-average common shares | 30,454 |  |  | 29,422 |  |  | 30,370 |  |  | 29,361 |
Diluted earnings per share | $ | 0.46 |  |  | $ | 0.39 |  |  | $ | 0.92 |  |  | $ | 0.74 |
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(1) | The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share if the performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary conditions have not been met. The Company has excluded the shares underlying the outstanding performance-based awards in the 2017 and 2016 calculations as the shares were not contingently issuable as of the end of the reporting periods.
In the three and six months ended June 30, 2017 and 2016, no outstanding stock awards were determined to be anti-dilutive and therefore excluded from the computation of diluted earnings 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 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1278-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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