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SHARE-BASED COMPENSATION - Share/Cash Settled Restricted Stock Units (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Weighted average grant date fair value |  |  |
Liability for cash-settled restricted stock units | $ 3,023 |  | $ 9,091
Restricted Stock Units (RSUs) |  |  |
Weighted average grant date fair value |  |  |
Share-based compensation expense | 15,011 | $ 12,339 |
Tax benefits associated with share-based compensation expense | 2,426 | 1,771 |
Fair value of restricted stock units vested | 46,970 | 39,981 |
Unrecognized share-based compensation expense | $ 125,964 | $ 122,163 |
Expected weighted average period associated with the recognition of unrecognized share-based compensation expense | 2 years 10 months 24 days | 3 years |
Restricted Stock Units (RSUs) | Cash Settled |  |  |
Weighted average grant date fair value |  |  |
Liability for cash-settled restricted stock units | $ 3,023 | $ 4,626 |
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) | 927 |  |
Vested (in shares) | (646) |  |
Forfeited (in shares) | (21) |  |
Nonvested restricted stock units - end of period (in shares) | 2,322 |  |
Weighted average grant date fair value |  |  |
Nonvested restricted stock units - beginning of period (in usd per share) | $ 51.59 |  |
Granted (in usd per share) | 56.00 |  |
Vested (in usd per share) | 52.57 |  |
Forfeited (in usd per share) | 51.34 |  |
Nonvested restricted stock units - end of period (in usd per share) | $ 53.08 |  |
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) | (2) |  |
Nonvested restricted stock units - end of period (in shares) | 74 |  |

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