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SHARE-BASED AWARDS AND STOCK OPTIONS - Stock Options Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | $ 37,165 | $ 27,822
Employee stock option |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | 2,400 | 1,900
Aggregate intrinsic value of stock options exercised | 20,600 | $ 53,600
Total unrecognized compensation cost | $ 14,100 |
Weighted-average period of unrecognized compensation cost | 2 years 3 months 18 days |
Weighted average grant date fair value for each option granted (USD per share) | $ 65.99 | $ 54.85

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- Definition Amount of cost to be recognized for option under share-based payment 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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