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STOCK PLANS AND SHARE BASED COMPENSATION (Performance-based Awards and Restricted Stock Units) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Performance Based Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of performance-based awards shares released as a percentage of target number, minimum | 0.00% |  |  |
Number of performance-based awards shares released as a percentage of target number, maximum | 200.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments [Roll Forward] |  |  |  |
Outstanding, shares | 150 | 121 | 52 | 158
Granted, shares | 150 | 185 | 178 |
Vested, shares | (121) | (52) | (158) |
Forfeited or expired, shares | 0 | (64) | (126) |
Outstanding, weighted-average grant date fair value per share, beginning of period | $ 35.06 | $ 31.44 | $ 32.00 |
Granted, weighted-average grant date fair value per share | 46.31 | 35.06 | 31.44 |
Vested, weighted-average grant date fair value per share | 35.06 | 31.44 | 32.00 |
Forfeited or expired, weighted-average grant date fair value per share | 0 | 35.06 | 31.44 |
Outstanding, weighted-average grant date fair value per share, end of period | $ 46.27 | $ 35.06 | $ 31.44 |
Outstanding, weighted-average remaining contractual term (in years) | 0 years |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Outstanding, Aggregate Intrinsic Value | $ 12,219 |  |  |
Outstanding and expected to vest, shares | 150 |  |  |
Outstanding and expected to vest, weighted-average remaining contractual term (in years) | 0 years |  |  |
Outstanding and expected to vest, aggregate intrinsic value | $ 12,219 |  |  |
Grant date fair value of awards released | $ 4,200 | $ 1,600 | $ 5,100 |
Long-Term Performance-based Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of performance-based awards shares released as a percentage of target number, minimum | 0.00% |  |  |
Number of performance-based awards shares released as a percentage of target number, maximum | 200.00% |  |  |
Performance based period | 3 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments [Roll Forward] |  |  |  |
Outstanding, shares | 301 | 287 | 426 | 368
Granted, shares | 152 | 144 | 144 |
Vested, shares | 0 | (140) | (76) |
Forfeited or expired, shares | (138) | (143) | (10) |
Outstanding, weighted-average grant date fair value per share, beginning of period | $ 32.03 | $ 27.74 | $ 26.40 |
Granted, weighted-average grant date fair value per share | 49.67 | 34.09 | 29.95 |
Vested, weighted-average grant date fair value per share | 0 | 21.63 | 26.23 |
Forfeited or expired, weighted-average grant date fair value per share | 29.95 | 31.50 | 21.63 |
Outstanding, weighted-average grant date fair value per share, end of period | $ 41.90 | $ 32.03 | $ 27.74 |
Outstanding, weighted-average remaining contractual term (in years) | 1 year 6 months 3 days |  |  |
Outstanding, aggregate intrinsic value | $ 24,637 |  |  |
Outstanding and expected to vest, shares | 272 |  |  |
Outstanding and expected to vest, weighted-average remaining contractual term (in years) | 1 year 6 months 14 days |  |  |
Outstanding and expected to vest, aggregate intrinsic value | $ 22,279 |  |  |
Grant date fair value of awards released |  | $ 3,000 | $ 2,000 |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards vesting period | 4 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments [Roll Forward] |  |  |  |
Outstanding, shares | 1,518 | 1,719 | 1,790 | 1,896
Granted, shares | 439 | 582 | 550 |
Vested, shares | (599) | (603) | (592) |
Forfeited or expired, shares | (41) | (50) | (64) |
Outstanding, weighted-average grant date fair value per share, beginning of period | $ 31.33 | $ 29.10 | $ 27.76 |
Granted, weighted-average grant date fair value per share | 44.82 | 34.90 | 31.43 |
Vested, weighted-average grant date fair value per share | 30.25 | 28.10 | 26.89 |
Forfeited or expired, weighted-average grant date fair value per share | 36.77 | 31.72 | 29.72 |
Outstanding, weighted-average grant date fair value per share, end of period | $ 35.51 | $ 31.33 | $ 29.10 |
Outstanding, weighted-average remaining contractual term (in years) | 1 year 5 months 1 day |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Outstanding, Aggregate Intrinsic Value | $ 124,239 |  |  |
Outstanding and expected to vest, shares | 1,423 |  |  |
Outstanding and expected to vest, weighted-average remaining contractual term (in years) | 1 year 4 months 9 days |  |  |
Outstanding and expected to vest, aggregate intrinsic value | $ 116,475 |  |  |
Grant date fair value of awards released | $ 18,100 | $ 16,900 | $ 15,900 |
$18.48 - $19.75 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Exercise Price Range, Lower Range Limit | $ 18.48 |  |  |
Options Outstanding, Exercise Price Range, Upper Range Limit | 19.75 |  |  |
$21.44 - $21.44 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Exercise Price Range, Lower Range Limit | 21.44 |  |  |
Options Outstanding, Exercise Price Range, Upper Range Limit | $ 21.44 |  |  |

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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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