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SHARE-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Weighted average grant date fair value |  |  |
Share based compensation costs expense | $ 25,410 | $ 28,557 |
Liability for cash-settled restricted stock units | 7,675 |  | $ 21,731
Restricted Stock Units (RSUs) |  |  |
Weighted average grant date fair value |  |  |
Tax benefits associated with share-based compensation expense | 3,995 | 4,263 |
Fair value of restricted stock units vested | 46,490 | 49,323 |
Unrecognized share-based compensation expense | $ 98,005 | $ 104,947 |
Expected weighted average period associated with the recognition of unrecognized share-based compensation expense | 2 years 8 months 12 days | 2 years 8 months 12 days |
Restricted Stock Units (RSUs) | Cash Settled |  |  |
Weighted average grant date fair value |  |  |
Liability for cash-settled restricted stock units | $ 7,675 | $ 12,946 |
Performance Vesting Restricted Stock Units | Share Settled |  |  |
Number of restricted stock units |  |  |
Nonvested restricted stock units - beginning of period (in shares) | 258 |  |
Granted (in shares) | 97 |  |
Vested (in shares) | (27) |  |
Forfeited (in shares) | 0 |  |
Nonvested restricted stock units - end of period (in shares) | 328 |  |
Weighted average grant date fair value |  |  |
Nonvested restricted stock units - beginning of period (in usd per share) | $ 53.31 |  |
Granted (in usd per share) | 62.26 |  |
Vested (in usd per share) | 64.01 |  |
Forfeited (in usd per share) | 0 |  |
Nonvested restricted stock units - end of period (in usd per share) | $ 55.09 |  |
Performance Vesting Restricted Stock Units | Cash Settled |  |  |
Number of restricted stock units |  |  |
Nonvested restricted stock units - beginning of period (in shares) | 6 |  |
Granted (in shares) | 0 |  |
Vested (in shares) | (6) |  |
Forfeited (in shares) | 0 |  |
Nonvested restricted stock units - end of period (in shares) | 0 |  |
Service Based Restricted Stock Units | Share Settled |  |  |
Number of restricted stock units |  |  |
Nonvested restricted stock units - beginning of period (in shares) | 1,273 |  |
Granted (in shares) | 786 |  |
Vested (in shares) | (474) |  |
Forfeited (in shares) | (40) |  |
Nonvested restricted stock units - end of period (in shares) | 1,545 |  |
Weighted average grant date fair value |  |  |
Nonvested restricted stock units - beginning of period (in usd per share) | $ 54.32 |  |
Granted (in usd per share) | 60.95 |  |
Vested (in usd per share) | 55.25 |  |
Forfeited (in usd per share) | 57.33 |  |
Nonvested restricted stock units - end of period (in usd per share) | $ 57.33 |  |
Service Based Restricted Stock Units | Cash Settled |  |  |
Number of restricted stock units |  |  |
Nonvested restricted stock units - beginning of period (in shares) | 853 |  |
Granted (in shares) | 1 |  |
Vested (in shares) | (322) |  |
Forfeited (in shares) | (25) |  |
Nonvested restricted stock units - end of period (in shares) | 507 |  |

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