Annual report pursuant to Section 13 and 15(d)

STOCK BASED AND DEFERRED COMPENSATION - Summary of Nonvested (Restricted) Shares and Units Activity (Details)

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STOCK BASED AND DEFERRED COMPENSATION - Summary of Nonvested (Restricted) Shares and Units Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
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) 659,102 692,529 790,617
Granted (in shares) 184,563 278,340 226,936
Vested (Earned/Released) (in shares) (210,611) (270,022) (264,513)
Forfeited (in shares) [1] (62,522) (41,745) (60,511)
Outstanding at end of year (in shares) 570,532 659,102 692,529
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) $ 80.52 $ 62.94 $ 50.67
Granted (in dollars per share) 112.36 94.12 85.19
Vested (Earned/Released) (in dollars per share) 69.46 49.42 46.09
Forfeited (in dollars per share) [1] 92.15 80.71 60.96
Outstanding at end of year (in dollars per share) $ 93.63 $ 80.52 $ 62.94
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) 144,667 190,751 307,928
Granted (in shares) 69,131 80,472 86,384
Vested (Earned/Released) (in shares) (80,915) (126,556) (203,561)
Forfeited (in shares) [1] 0 0 0
Outstanding at end of year (in shares) 132,883 144,667 190,751
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) $ 71.33 $ 61.68 $ 49.16
Granted (in dollars per share) 101.30 59.67 65.91
Vested (Earned/Released) (in dollars per share) 73.17 43.28 44.92
Forfeited (in dollars per share) [1] 0 0 0
Outstanding at end of year (in dollars per share) $ 100.66 $ 71.33 $ 61.68
Shares issued as a result of performance achievement (in shares) 26,167 37,425  
Nonvested Restricted Share Activity (performance- based) [Member] | General Counsel      
Nonvested Restricted Share Activity (time-based and performance-based), Weighted Average Grant Date Fair Value [Roll Forward]      
Shares issued as a result of performance achievement (in shares) 1,670 696  
[1]
(1)Performance-based shares granted and earned/released for the year ended December 31, 2021 includes 37,425 shares that were issued as a result of the performance achievement exceeding the performance targets related to grants to our executive officers for the year ended December 31, 2018. These shares vested in March 2021. Performance-based shares granted for the year ended December 31, 2021 also includes 1,670 shares and 696 shares that were issued to our former General Counsel, who retired on December 15, 2021, as a result of the performance achievement exceeding the performance targets related to grants to our executive officers for the years ended December 31, 2019 and 2018, respectively. These shares vested in December 2021 in accordance with his employment agreement.
(2)Forfeitures on time-based nonvested shares are a result of terminations of employment, while forfeitures on performance-based nonvested shares are the result of failing to attain certain goals as outlined in our executive officers' compensation agreements.
(3)Performance-based shares granted and earned/released for the year ended December 31, 2022 includes 37,146 shares that were issued as a result of the performance achievement exceeding the performance targets related to grants to our executive officers for the year ended December 31, 2019. These shares vested in March 2022.
(4)Performance-based shares granted and earned/released for the year ended December 31, 2023 includes 26,167 shares that were issued as a result of the performance achievement exceeding the performance targets related to grants to our executive officers for the year ended December 31, 2020. These shares vested in February 2023.