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SHARE-BASED COMPENSATION - RSUs to Employees (Details) - RSUs - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SHARE-BASED COMPENSATION |  |  |
Shares granted to employees | 2,161,098 | 1,105,640 | 706,637
Weighted average grant date fair value | $ 26.10 |  |
Number of unvested awards outstanding | 3,335,303 | 1,888,753 |
Total compensation cost at the date of grant | $ 55,822 | $ 24,918 | $ 12,179
Total recognized compensation cost | 8,808 | $ 12,350 | $ 10,682
Total unrecognized share-based compensation costs | $ 22,002 |  |
Weighted-average period of recognition of compensation expense | 2 years 4 months 6 days |  |
Number of Shares |  |  |
Unvested at the beginning of the period (in shares) | 1,888,753 |  |
Granted (in shares) | 2,161,098 | 1,105,640 | 706,637
Vested (in shares) | (562,376) |  |
Forfeited (in shares) | (152,172) |  |
Unvested at the end of the period (in shares) | 3,335,303 | 1,888,753 |
Weighted Average Grant-Date Fair Value |  |  |
Unvested at the beginning of the period (in dollars per share) | $ 19.78 |  |
Granted (in dollars per share) | 26.10 |  |
Vested (in dollars per share) | 17.11 |  |
Forfeited (in dollars per share) | 22.04 |  |
Unvested at the end of the period (in dollars per share) | $ 24.23 | $ 19.78 |
Total fair value of shares vested | $ 21,628 | $ 14,420 | $ 10,733
Employees |  |  |
SHARE-BASED COMPENSATION |  |  |
Shares granted to employees |  | 2,096,000 |
Vesting percentage |  | 50.00% |
Weighted average grant date fair value |  | $ 25.69 |
Number of unvested awards outstanding | 2,076,000 |  |
Number of Shares |  |  |
Granted (in shares) |  | 2,096,000 |
Unvested at the end of the period (in shares) | 2,076,000 |  |
Weighted Average Grant-Date Fair Value |  |  |
Granted (in dollars per share) |  | $ 25.69 |
Tranche one | Employees |  |  |
SHARE-BASED COMPENSATION |  |  |
Vesting percentage |  | 25.00% |
Tranche two | Employees |  |  |
SHARE-BASED COMPENSATION |  |  |
Vesting percentage |  | 25.00% |
Minimum |  |  |
SHARE-BASED COMPENSATION |  |  |
Grant period (in years) | 1 year |  |
Maximum |  |  |
SHARE-BASED COMPENSATION |  |  |
Grant period (in years) | 4 years |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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