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STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
STOCK-BASED COMPENSATION |  |  |  |
Total intrinsic value of options exercised |  |  | $ 36,200 | $ 211,300
Compensation cost charged against income |  |  |  |
Total employee and non-employee share-based compensation expense included in income, before income tax |  |  | $ 33,034 | $ 30,899
Stock Options |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Weighted-average grant-date fair value of options granted (in dollars per share) |  |  | $ 18.78 | $ 20.30
Total intrinsic value of options exercised | $ 25,300 | $ 32,900 |  |
Cash received from option exercises | 29,900 | $ 46,000 | $ 43,800 | $ 81,100
Total unrecognized compensation expense related to non-vested shares granted to employees | $ 77,800 |  | $ 77,800 |
Cost expected to be recognized over a weighted-average period |  |  | 2 years 6 months |
Stock units expected to vest (in shares) | 14,036 |  | 14,036 |
Restricted stock units |  |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |
Granted (in dollars per share) | $ 71.72 | $ 63.48 |  |
Restricted Stock Units and Performance Share Units |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Total unrecognized compensation expense related to non-vested shares granted to employees | $ 43,000 |  | $ 43,000 |
Cost expected to be recognized over a weighted-average period |  |  | 2 years 8 months 12 days |
Stock units expected to vest (in shares) | 800 |  | 800 |
Number of Shares |  |  |  |
Non-vested at the beginning of the period (in shares) |  |  | 825 |
Vested (in shares) |  |  | (287) |
Forfeited/cancelled (in shares) |  |  | (1) |
Non-vested at the end of the period (in shares) | 946 |  | 946 |
Weighted Average Grant-Date Fair Value |  |  |  |
Non-vested at the beginning of the period (in dollars per share) |  |  | $ 57.62 |
Granted (in dollars per share) |  |  | 62.78 | $ 59.79
Vested (in dollars per share) |  |  | 55.65 |
Forfeited/cancelled (in dollars per share) |  |  | 59.67 |
Non-vested at the end of the period (in dollars per share) | $ 60.45 |  | $ 60.45 |
Restricted Stock Units and Performance Share Units | Granted 01/01/20 - 03/31/20 |  |  |  |
Number of Shares |  |  |  |
Granted (in shares) |  |  | 392 |
Weighted Average Grant-Date Fair Value |  |  |  |
Granted (in dollars per share) |  |  | $ 62.39 |
Restricted Stock Units and Performance Share Units | Granted 04/01/20 - 06/30/20 |  |  |  |
Number of Shares |  |  |  |
Granted (in shares) |  |  | 17 |
Weighted Average Grant-Date Fair Value |  |  |  |
Granted (in dollars per share) |  |  | $ 71.72 |
Performance Share Units |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Percentage of Target Performance Level |  |  | 100.00% |
Number of Shares |  |  |  |
Granted (in shares) |  |  |  | 0
Weighted Average Grant-Date Fair Value |  |  |  |
Granted (in dollars per share) | $ 0 | $ 0 |  |
Performance Share Units | Maximum |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Percentage of Target Performance Level |  |  | 200.00% |
Performance Share Units | Minimum |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Percentage of Target Performance Level |  |  | 0.00% |

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- Definition The number of grants made 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 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 The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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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