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, 2021
Dec. 31, 2020
Dec. 31, 2019
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) 790,617 834,620 923,290
Granted (in shares) 226,936 225,593 385,328
Vested (Earned/Released) (in shares) (264,513) (234,842) (347,555)
Forfeited (in shares) [1] (60,511) (34,754) (126,443)
Outstanding at end of year (in shares) 692,529 790,617 834,620
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) $ 50.67 $ 41.25 $ 38.25
Granted (in dollars per share) 85.19 72.51 44.46
Vested (Earned/Released) (in dollars per share) 46.09 38.80 37.15
Forfeited (in dollars per share) [1] 60.96 46.31 40.45
Outstanding at end of year (in dollars per share) $ 62.94 $ 50.67 $ 41.25
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) 307,928 405,909 378,455
Granted (in shares) 86,384 80,193 115,191
Vested (Earned/Released) (in shares) (203,561) (178,174) (87,737)
Forfeited (in shares) [1] 0 0 0
Outstanding at end of year (in shares) 190,751 307,928 405,909
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) $ 49.16 $ 40.20 $ 38.77
Granted (in dollars per share) 65.91 61.06 40.46
Vested (Earned/Released) (in dollars per share) 44.92 34.10 34.39
Forfeited (in dollars per share) [1] 0 0 0
Outstanding at end of year (in dollars per share) $ 61.68 $ 49.16 $ 40.20
Shares issued as a result of performance achievement (in shares) 37,425 24,054 21,039
[1]
(1)Performance-based shares granted for the year ended December 31, 2019 includes 21,039 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, 2016. These shares vested in March 2019.
(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 for the year ended December 31, 2020 includes 24,054 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, 2017. These shares vested in February 2020.
(4)Performance-based shares granted 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 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.