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SHARE-BASED COMPENSATION - Stock Option Activity (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Weighted Average Exercise Price Per Share |  |  |  |  |
Exercised, weighted average exercise price per share (in dollars per share) |  |  | $ 17.45 |  |
Share based compensation expense | $ 27,646,000 | $ 34,318,000 | $ 55,927,000 | $ 62,264,000 |
Share based compensation - Unrecognized deferred compensation cost | $ 160,592,000 |  | $ 160,592,000 |  |
Risk-free interest rate |  |  | 1.03% |  |
Expected life (in years) |  |  | 6 years 3 months |  |
Dividend yield |  |  | 0.00% |  |
Volatility |  |  | 32.94% |  |
Grant date fair value |  |  | $ 11.45 |  |
2017 LTIP |  |  |  |  |
Weighted Average Exercise Price Per Share |  |  |  |  |
Beginning balance (in dollars per share) |  |  | 25.52 |  |
Granted (in dollars per share) |  |  | 34.45 |  |
Forfeited (in dollars per share) |  |  | 26.83 |  |
Ending balance (in dollars per share) | $ 25.99 |  | 25.99 |  |
Options exercisable (in dollars per share) | $ 20.00 |  | $ 20.00 |  |
Options outstanding, Weighted Average Remaining Contractual Term (in years) |  |  | 8 years 1 month 6 days | 8 years 8 months 8 days |
Options exercisable, Weighted Average Remaining Contractual Term (in years) |  |  | 6 years 10 months 2 days |  |
Options outstanding, Aggregate Intrinsic Value | $ 294,984,000 |  | $ 294,984,000 |  | $ 457,608,000
Options exercisable, Aggregate Intrinsic Value | $ 54,504,000 |  | $ 54,504,000 |  |
2017 LTIP | Share-based Payment Arrangement, Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Beginning balance (in shares) |  |  | 37,062,146 |  |
Granted (in shares) |  |  | 896,398 |  |
Option exercises |  |  | 1,206,372 |  |
Forfeited (in shares) |  |  | (655,043) |  |
Ending balance (in shares) | 36,097,129 |  | 36,097,129 |  |
Options exercisable (in shares) | 3,854,992 |  | 3,854,992 |  |
Weighted Average Exercise Price Per Share |  |  |  |  |
Share based compensation expense | $ 24,473,000 | 25,327,000 | $ 48,696,000 | $ 45,676,000 |
Share based compensation - Unrecognized deferred compensation cost | 102,654,000 |  | $ 102,654,000 |  |
Expected time (in years) unrecogized compensation costs relating to share based awards will be recognized |  |  | 2 years 4 months 9 days |  |
2017 LTIP | Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Granted (in shares) |  |  | 7,313,873 |  |
Weighted Average Exercise Price Per Share |  |  |  |  |
Share based compensation expense | 2,868,000 | 4,419,000 | $ 5,850,000 | 8,320,000 |
Share based compensation - Unrecognized deferred compensation cost | 57,633,000 |  | $ 57,633,000 |  |
Expected time (in years) unrecogized compensation costs relating to share based awards will be recognized |  |  | 4 years 6 months 3 days |  |
Grant date fair value |  |  | $ 10.65 |  |
2019 LTIP | Restricted Stock |  |  |  |  |
Weighted Average Exercise Price Per Share |  |  |  |  |
Share based compensation expense | 261,000 | $ 635,000 | $ 578,000 | $ 1,211,000 |
Share based compensation - Unrecognized deferred compensation cost | $ 305,000 |  | $ 305,000 |  |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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 (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 + Details
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