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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 | 61 | 26 | 79 | 99
Granted, shares | 93 | 89 | 88 |
Vested, shares | (26) | (79) | (99) |
Forfeited or expired, shares | (32) | (63) | (9) |
Outstanding, weighted-average grant date fair value per share, beginning of period | $ 62.87 | $ 63.99 | $ 46.25 |
Granted, weighted-average grant date fair value per share | 70.11 | 62.87 | 63.99 |
Vested, weighted-average grant date fair value per share | 62.87 | 63.99 | 46.25 |
Forfeited or expired, weighted-average grant date fair value per share | 70.11 | 62.87 | 63.99 |
Outstanding, weighted-average grant date fair value per share, end of period | $ 70.11 | $ 62.87 | $ 63.99 |
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 | $ 5,999 |  |  |
Outstanding and expected to vest, shares | 61 |  |  |
Outstanding and expected to vest, weighted-average remaining contractual term (in years) | 0 years |  |  |
Outstanding and expected to vest, aggregate intrinsic value | $ 5,999 |  |  |
Grant date fair value of awards released | $ 1,600 | $ 5,100 | $ 4,600 |
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 | 144 | 213 | 184 | 150
Granted, shares | 72 | 72 | 71 |
Vested, shares | (70) | (38) | 0 |
Forfeited or expired, shares | (71) | (5) | (37) |
Outstanding, weighted-average grant date fair value per share, beginning of period | $ 55.48 | $ 52.80 | $ 47.65 |
Granted, weighted-average grant date fair value per share | 68.17 | 59.90 | 63.00 |
Vested, weighted-average grant date fair value per share | 43.26 | 52.45 | 0 |
Forfeited or expired, weighted-average grant date fair value per share | 63.00 | 43.26 | 51.59 |
Outstanding, weighted-average grant date fair value per share, end of period | $ 64.05 | $ 55.48 | $ 52.80 |
Outstanding, weighted-average remaining contractual term (in years) | 1 year 6 months |  |  |
Outstanding, aggregate intrinsic value | $ 14,203 |  |  |
Outstanding and expected to vest, shares | 58 |  |  |
Outstanding and expected to vest, weighted-average remaining contractual term (in years) | 2 years |  |  |
Outstanding and expected to vest, aggregate intrinsic value | $ 5,768 |  |  |
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 | 860 | 895 | 948 | 718
Granted, shares | 291 | 275 | 558 |
Vested, shares | (301) | (296) | (284) |
Forfeited or expired, shares | (25) | (32) | (44) |
Outstanding, weighted-average grant date fair value per share, beginning of period | $ 58.19 | $ 55.51 | $ 47.54 |
Granted, weighted-average grant date fair value per share | 69.79 | 62.85 | 60.82 |
Vested, weighted-average grant date fair value per share | 56.19 | 53.78 | 46.52 |
Forfeited or expired, weighted-average grant date fair value per share | 63.43 | 59.43 | 50.89 |
Outstanding, weighted-average grant date fair value per share, end of period | $ 62.66 | $ 58.19 | $ 55.51 |
Outstanding, weighted-average remaining contractual term (in years) | 1 year 6 months 29 days |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Outstanding, Aggregate Intrinsic Value | $ 85,037 |  |  |
Outstanding and expected to vest, shares | 801 |  |  |
Outstanding and expected to vest, weighted-average remaining contractual term (in years) | 1 year 6 months |  |  |
Outstanding and expected to vest, aggregate intrinsic value | $ 79,192 |  |  |
Grant date fair value of awards released | $ 16,900 | $ 15,900 | $ 13,200 |
Exercise Price Range One [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Exercise Price Range, Lower Range Limit | $ 32.26 |  |  |
Options Outstanding, Exercise Price Range, Upper Range Limit | 38.07 |  |  |
Exercise Price Range Two [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Exercise Price Range, Lower Range Limit | 39.49 |  |  |
Options Outstanding, Exercise Price Range, Upper Range Limit | $ 42.88 |  |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(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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