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SHARE-BASED COMPENSATION - Share/Cash Settled Restricted Stock Units (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Weighted average grant date fair value |  |  |
Liability for cash-settled restricted stock units | $ 3,796 |  | $ 9,091
Performance Vesting Restricted Stock Units | Share Settled |  |  |
Number of restricted stock units |  |  |
Nonvested restricted stock units - beginning of period (in shares) | 311 |  |
Granted (in shares) | 140 |  |
Vested (in shares) | (100) |  |
Forfeited (in shares) | 0 |  |
Nonvested restricted stock units - end of period (in shares) | 351 |  |
Weighted average grant date fair value |  |  |
Nonvested restricted stock units - beginning of period (in usd per share) | $ 54.75 |  |
Granted (in usd per share) | 68.63 |  |
Vested (in usd per share) | 54.70 |  |
Forfeited (in usd per share) | 0 |  |
Nonvested restricted stock units - end of period (in usd per share) | $ 60.15 |  |
Service Based Restricted Stock Units | Share Settled |  |  |
Number of restricted stock units |  |  |
Nonvested restricted stock units - beginning of period (in shares) | 2,062 |  |
Granted (in shares) | 945 |  |
Vested (in shares) | (665) |  |
Forfeited (in shares) | (146) |  |
Nonvested restricted stock units - end of period (in shares) | 2,196 |  |
Weighted average grant date fair value |  |  |
Nonvested restricted stock units - beginning of period (in usd per share) | $ 51.59 |  |
Granted (in usd per share) | 56.01 |  |
Vested (in usd per share) | 52.66 |  |
Forfeited (in usd per share) | 52.78 |  |
Nonvested restricted stock units - end of period (in usd per share) | $ 53.09 |  |
Service Based Restricted Stock Units | Cash Settled |  |  |
Number of restricted stock units |  |  |
Nonvested restricted stock units - beginning of period (in shares) | 215 |  |
Granted (in shares) | 0 |  |
Vested (in shares) | (139) |  |
Forfeited (in shares) | (7) |  |
Nonvested restricted stock units - end of period (in shares) | 69 |  |
Restricted Stock Units (RSUs) |  |  |
Weighted average grant date fair value |  |  |
Share-based compensation expense | $ 29,052 | $ 25,080 |
Tax benefits associated with share-based compensation expense | 4,956 | 4,075 |
Fair value of restricted stock units vested | 48,121 | 41,671 |
Unrecognized share-based compensation expense | $ 106,007 | $ 107,267 |
Expected weighted average period associated with the recognition of unrecognized share-based compensation expense | 2 years 8 months 12 days | 2 years 9 months 18 days |
Restricted Stock Units (RSUs) | Cash Settled |  |  |
Weighted average grant date fair value |  |  |
Liability for cash-settled restricted stock units | $ 3,796 | $ 5,804 |

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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 Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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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