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EMPLOYEE BENEFIT PLANS (Stock Option Activity) (Details) - Stock Options - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Outstanding at beginning of period (in shares) | 344,276 | 453,843 | 440,158
Granted (in shares) | 48,300 | 82,500 | 95,500
Exercised (in shares) | (116,918) | (177,299) | (81,815)
Canceled or expired (in shares) |  | (14,768) |
Outstanding at end of period (in shares) | 275,658 | 344,276 | 453,843
Exercisable at end of period (in shares) | 147,620 | 185,405 | 278,239
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |
Weighted-average exercise price, outstanding at beginning of period (in dollars per share) | $ 212.28 | $ 156.24 | $ 132.08
Weighted-average exercise price, granted (in dollars per share) | 398.15 | 342.13 | 204.91
Weighted-average exercise price, exercised (in dollars per share) | 159.52 | 125.16 | 83.07
Weighted-average exercise price, canceled or expired (in dollars per share) |  | 261.20 |
Weighted-average exercise price, outstanding at end of period (in dollars per share) | 267.23 | 212.28 | 156.24
Weighted-average exercise price, exercisable at end of period (in dollars per share) | $ 210.96 | 165.31 | 130.91
Weighted-average remaining contract life of options outstanding at end of period | 6 years 11 months 23 days |  |
Weighted-average remaining contract life of options exercisable at end of period | 5 years 10 months 2 days |  |
Aggregate intrinsic value of options outstanding at end of period | $ 91,262 |  |
Aggregate intrinsic value of options exercisable at end of period | $ 57,180 |  |
Share Based Compensation Exercisable Range [Abstract] |  |  |
Granted (dollars per share) |  | 342.13 | 204.91
Exercised (dollars per share) | $ 398.15 |  |
Minimum |  |  |
Share Based Compensation Exercisable Range [Abstract] |  |  |
Outstanding (dollars per share) | 182.75 | 36.73 | 36.48
Exercised (dollars per share) |  | 36.73 | 36.48
Canceled or expired (dollars per share) | 54.51 |  |
Outstanding (dollars per share) | 54.51 | 182.75 | 36.73
Exercisable at end of period (dollars per share) | 54.51 | 36.73 | 36.48
Maximum |  |  |
Share Based Compensation Exercisable Range [Abstract] |  |  |
Outstanding (dollars per share) | 342.13 | 204.91 | 201.04
Exercised (dollars per share) |  | 204.91 | 201.04
Canceled or expired (dollars per share) | 342.13 |  |
Outstanding (dollars per share) | 398.15 | 342.13 | 204.91
Exercisable at end of period (dollars per share) | $ 204.91 | $ 201.04 | $ 201.04

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