STOCK BASED AND DEFERRED COMPENSATION - Summary of Nonvested (Restricted) Shares and Units Activity (Details) - $ / shares |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Nonvested Restricted Share Activity (time-based) [Member] | |||||
| Nonvested Restricted Share Activity (time-based and performance-based), Number of Shares [Roll Forward] | |||||
| Outstanding at beginning of year (in shares) | 834,620 | 923,290 | 982,652 | ||
| Granted (in shares) | 225,593 | 385,328 | 315,247 | ||
| Vested (Earned/Released) (in shares) | (234,842) | (347,555) | (288,709) | ||
| Forfeited (in shares) | [1] | (34,754) | (126,443) | (85,900) | |
| Outstanding at end of year (in shares) | 790,617 | 834,620 | 923,290 | ||
| Nonvested Restricted Share Activity (time-based and performance-based), Weighted Average Grant Date Fair Value [Roll Forward] | |||||
| Outstanding at beginning of year (in dollars per share) | $ 41.25 | $ 38.25 | $ 35.59 | ||
| Granted (in dollars per share) | 72.51 | 44.46 | 46.07 | ||
| Vested (Earned/Released) (in dollars per share) | 38.80 | 37.15 | 37.93 | ||
| Forfeited (in dollars per share) | [1] | 46.31 | 40.45 | 37.53 | |
| Outstanding at end of year (in dollars per share) | $ 50.67 | $ 41.25 | $ 38.25 | ||
| Nonvested Restricted Share Activity (performance- based) [Member] | |||||
| Nonvested Restricted Share Activity (time-based and performance-based), Number of Shares [Roll Forward] | |||||
| Outstanding at beginning of year (in shares) | 405,909 | 378,455 | 287,005 | ||
| Granted (in shares) | 80,193 | 115,191 | 157,637 | ||
| Vested (Earned/Released) (in shares) | (178,174) | (87,737) | (36,801) | ||
| Forfeited (in shares) | [1] | 0 | 0 | (29,386) | |
| Outstanding at end of year (in shares) | 307,928 | 405,909 | 378,455 | ||
| Nonvested Restricted Share Activity (time-based and performance-based), Weighted Average Grant Date Fair Value [Roll Forward] | |||||
| Outstanding at beginning of year (in dollars per share) | $ 40.20 | $ 38.77 | $ 35.80 | ||
| Granted (in dollars per share) | 61.06 | 40.46 | 45.20 | ||
| Vested (Earned/Released) (in dollars per share) | 34.10 | 34.39 | 41.17 | ||
| Forfeited (in dollars per share) | [1] | 0 | 0 | 41.17 | |
| Outstanding at end of year (in dollars per share) | $ 49.16 | $ 40.20 | $ 38.77 | ||
| Shares issued as a result of performance achievement (in shares) | 24,054 | 21,039 | |||
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