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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, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Weighted average grant date fair value |  |  |
Liability for cash-settled restricted stock units | $ 4,626 |  | $ 13,273
Performance Vesting Restricted Stock Units | Share Settled |  |  |
Number of restricted stock units |  |  |
Nonvested restricted stock units - beginning of period (in shares) | 289 |  |
Granted (in shares) | 122 |  |
Vested (in shares) | (66) |  |
Forfeited (in shares) | 0 |  |
Nonvested restricted stock units - end of period (in shares) | 345 |  |
Weighted average grant date fair value |  |  |
Nonvested restricted stock units - beginning of period (in usd per share) | $ 55.92 |  |
Granted (in usd per share) | 49.04 |  |
Vested (in usd per share) | 48.89 |  |
Forfeited (in usd per share) | 0 |  |
Nonvested restricted stock units - end of period (in usd per share) | $ 54.84 |  |
Service Based Restricted Stock Units | Share Settled |  |  |
Number of restricted stock units |  |  |
Nonvested restricted stock units - beginning of period (in shares) | 1,501 |  |
Granted (in shares) | 1,180 |  |
Vested (in shares) | (523) |  |
Forfeited (in shares) | (20) |  |
Nonvested restricted stock units - end of period (in shares) | 2,138 |  |
Weighted average grant date fair value |  |  |
Nonvested restricted stock units - beginning of period (in usd per share) | $ 56.50 |  |
Granted (in usd per share) | 47.88 |  |
Vested (in usd per share) | 56.38 |  |
Forfeited (in usd per share) | 56.58 |  |
Nonvested restricted stock units - end of period (in usd per share) | $ 51.77 |  |
Service Based Restricted Stock Units | Cash Settled |  |  |
Number of restricted stock units |  |  |
Nonvested restricted stock units - beginning of period (in shares) | 471 |  |
Granted (in shares) | 0 |  |
Vested (in shares) | (213) |  |
Forfeited (in shares) | (9) |  |
Nonvested restricted stock units - end of period (in shares) | 248 |  |
Restricted Stock Units (RSUs) |  |  |
Weighted average grant date fair value |  |  |
Share based compensation costs expense | $ 12,339 | $ 13,132 |
Tax benefits associated with share-based compensation expense | 1,771 | 1,889 |
Fair value of restricted stock units vested | 39,981 | 45,565 |
Unrecognized share-based compensation expense | $ 122,163 | $ 111,909 |
Expected weighted average period associated with the recognition of unrecognized share-based compensation expense | 3 years | 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 | $ 4,626 | $ 5,711 |

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