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EQUITY AND LONG-TERM INCENTIVE COMPENSATION (Details) - shares shares in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Income Per Share |  |  |  |
Weighted-average number of common shares used in basic income per share | 42,988 | 42,388 | 42,881 | 42,249
Dilutive securities — Employee stock options, restricted stock shares and restricted stock units (in shares) | 1,735 | 0 | 1,664 | 1,373
Weighted-average number of common shares and dilutive securities used in diluted income per share | 44,723 | 42,388 | 44,545 | 43,622
Restricted stock shares/units |  |  |  |
Stock-based Compensation |  |  |  |
Number of options or units that were excluded from the computation of diluted income per share | 327 | 476 | 305 | 435
Stock options |  |  |  |
Stock-based Compensation |  |  |  |
Number of options or units that were excluded from the computation of diluted income per share | 909 | 1,037 | 889 | 1,010
Restricted Stock And Restricted Stock Units Excluded from Computation of Diluted Income Per Share Due to Net Loss |  |  |  |
Stock-based Compensation |  |  |  |
Number of options or units that were excluded from the computation of diluted income per share |  | 804 |  |
Employee Stock Options Excluded from Computation of Diluted Income Per Share Due to Net Loss |  |  |  |
Stock-based Compensation |  |  |  |
Number of options or units that were excluded from the computation of diluted income per share |  | 597 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1500-109256 + Details
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