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STOCK-BASED COMPENSATION - RSU and RSA Activity (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 31, 2017
RSUs |  |  |  |  |
Nonvested RSUs and RSAs, Number of Shares |  |  |  |  |
Nonvested at the beginning of the period (in shares) |  | 144,939 |  |  |
Granted (in shares) |  | 138,418 |  |  |
Vested (in shares) |  | (70,698) |  |  |
Forfeited (in shares) |  | (17,973) |  |  |
Nonvested at the end of the period (in shares) |  | 194,686 | 144,939 |  |
Nonvested RSUs and RSAs, Weighted Average Grant Date Fair Value |  |  |  |  |
Nonvested at the beginning of the period (in dollars per share) |  | $ 267.85 |  |  |
Granted (in dollars per share) |  | 286.42 |  |  |
Vested (in dollars per share) |  | 239.15 |  |  |
Forfeited (in dollars per share) |  | 285.95 |  |  |
Nonvested at the end of the period (in dollars per share) |  | $ 289.82 | $ 267.85 |  |
Unrecognized compensation cost |  | $ 35.2 |  |  |
Weighted-average period for recognition of unrecognized compensation cost |  | 1 year 8 months 12 days |  |  |
Vested fair value |  | $ 22.4 | $ 27.2 | $ 21.8 |
Performance Shares |  |  |  |  |
Nonvested RSUs and RSAs, Number of Shares |  |  |  |  |
Nonvested at the beginning of the period (in shares) |  | 14,647 |  |  |
Granted (in shares) |  | 0 | 0 |  |
Vested (in shares) |  | (8,319) |  |  |
Forfeited (in shares) |  | 0 |  |  |
Nonvested at the end of the period (in shares) |  | 6,328 | 14,647 |  |
Nonvested RSUs and RSAs, Weighted Average Grant Date Fair Value |  |  |  |  |
Nonvested at the beginning of the period (in dollars per share) |  | $ 210.55 |  |  |
Granted (in dollars per share) |  | 0 |  |  |
Vested (in dollars per share) |  | 200.40 |  |  |
Forfeited (in dollars per share) |  | 0 |  |  |
Nonvested at the end of the period (in dollars per share) |  | $ 223.90 | $ 210.55 |  |
Unrecognized compensation cost |  | $ 1.1 |  |  |
Weighted-average period for recognition of unrecognized compensation cost |  | 9 months 18 days |  |  |
Vested fair value |  | $ 2.6 | $ 18.8 | 7.9 |
Performance-Based Restricted Stock |  |  |  |  |
Nonvested RSUs and RSAs, Number of Shares |  |  |  |  |
Nonvested at the beginning of the period (in shares) |  | 47,608 |  |  |
Granted (in shares) |  | 0 | 0 |  |
Vested (in shares) |  | (23,804) |  |  |
Forfeited (in shares) |  | 0 |  |  |
Nonvested at the end of the period (in shares) |  | 23,804 | 47,608 |  |
Nonvested RSUs and RSAs, Weighted Average Grant Date Fair Value |  |  |  |  |
Nonvested at the beginning of the period (in dollars per share) |  | $ 340.25 |  |  |
Granted (in dollars per share) |  | 0 |  |  |
Vested (in dollars per share) |  | 340.25 |  |  |
Forfeited (in dollars per share) |  | 0 |  |  |
Nonvested at the end of the period (in dollars per share) |  | $ 340.25 | $ 340.25 |  |
Unrecognized compensation cost |  | $ 4.4 |  |  |
Weighted-average period for recognition of unrecognized compensation cost |  | 1 year |  |  |
Vested fair value |  | $ 6.2 | $ 8.2 | 13.6 |
Grant date fair value |  |  |  |  | $ 21.9
Expiration period | 6 months |  |  |  |
Market-Based Restricted Stock |  |  |  |  |
Nonvested RSUs and RSAs, Number of Shares |  |  |  |  |
Nonvested at the beginning of the period (in shares) |  | 26,674 |  |  |
Granted (in shares) |  | 0 |  |  |
Vested (in shares) |  | 0 |  |  |
Forfeited (in shares) |  | 0 |  |  |
Nonvested at the end of the period (in shares) |  | 26,674 | 26,674 |  |
Nonvested RSUs and RSAs, Weighted Average Grant Date Fair Value |  |  |  |  |
Nonvested at the beginning of the period (in dollars per share) |  | $ 340.25 |  |  |
Granted (in dollars per share) |  | 0 |  |  |
Vested (in dollars per share) |  | 0 |  |  |
Forfeited (in dollars per share) |  | 0 |  |  |
Nonvested at the end of the period (in dollars per share) |  | $ 340.25 | $ 340.25 |  |
Unrecognized compensation cost |  | $ 0.7 |  |  |
Weighted-average period for recognition of unrecognized compensation cost |  | 1 year 9 months 18 days |  |  |
Grant date fair value |  |  |  | $ 1.9 |
Return performance, percent of target stock price |  |  |  | 110.00% |
Maximum number of shares for earned (in shares) |  |  |  | 44,545 |
Performance awards earned (in shares) |  | 29,601 |  |  |
Minimum | Performance Shares |  |  |  |  |
Nonvested RSUs and RSAs, Weighted Average Grant Date Fair Value |  |  |  |  |
Vesting period |  | 6 months |  |  |
Minimum | Market-Based Restricted Stock |  |  |  |  |
Nonvested RSUs and RSAs, Weighted Average Grant Date Fair Value |  |  |  |  |
Return performance, percent of target stock price |  |  |  | 70.00% |

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