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, 2019
Dec. 31, 2018
Dec. 31, 2017
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) 923,290 982,652 962,303
Granted (in shares) 385,328 315,247 430,575
Vested (Earned/Released) (in shares) (347,555) (288,709) (279,856)
Forfeited (in shares) [1] (126,443) (85,900) (130,370)
Outstanding at end of year (in shares) 834,620 923,290 982,652
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) $ 38.25 $ 35.59 $ 37.00
Granted (in dollars per share) 44.46 46.07 34.45
Vested (Earned/Released) (in dollars per share) 37.15 37.93 38.39
Forfeited (in dollars per share) [1] 40.45 37.53 35.09
Outstanding at end of year (in dollars per share) $ 41.25 $ 38.25 $ 35.59
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) 378,455 287,005 184,968
Granted (in shares) 115,191 157,637 154,120
Vested (Earned/Released) (in shares) (87,737) (36,801) (20,367)
Forfeited (in shares) [1] 0 (29,386) (31,716)
Outstanding at end of year (in shares) 405,909 378,455 287,005
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) $ 38.77 $ 35.80 $ 34.84
Granted (in dollars per share) 40.46 45.20 34.10
Vested (Earned/Released) (in dollars per share) 34.39 41.17 45.60
Forfeited (in dollars per share) [1] 0 41.17 45.60
Outstanding at end of year (in dollars per share) $ 40.20 $ 38.77 $ 35.80
Shares issued as a result of performance achievement (in shares) 21,039    
[1] Forfeitures on time-based nonvested shares are a result of terminations of employment, while forfeitures on performance-based nonvested shares are a result of failing to attain certain goals as outlined in our executive officers' compensation agreements.(2)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.