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, 2018
Dec. 31, 2017
Dec. 31, 2016
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) 982,652 962,303 883,707
Granted (in shares) 315,247 430,575 499,865
Vested (Earned/Released) (in shares) (288,709) (279,856) (305,359)
Forfeited (in shares) [1] (85,900) (130,370) (115,910)
Outstanding at end of year (in shares) 923,290 982,652 962,303
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) $ 35.59 $ 37.00 $ 40.75
Granted (in dollars per share) 46.07 34.45 31.60
Vested (Earned/Released) (in dollars per share) 37.93 38.39 30.87
Forfeited (in dollars per share) [1] 37.53 35.09 36.79
Outstanding at end of year (in dollars per share) $ 38.25 $ 35.59 $ 37.00
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) 287,005 184,968 180,770
Granted (in shares) 157,637 154,120 66,698
Vested (Earned/Released) (in shares) (36,801) (20,367) (41,665)
Forfeited (in shares) [1] (29,386) (31,716) (20,835)
Outstanding at end of year (in shares) 378,455 287,005 184,968
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) $ 35.80 $ 34.84 $ 42.93
Granted (in dollars per share) 45.20 34.10 34.39
Vested (Earned/Released) (in dollars per share) 41.17 45.60 31.02
Forfeited (in dollars per share) [1] 41.17 45.60 42.56
Outstanding at end of year (in dollars per share) $ 38.77 $ 35.80 $ 34.84
[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.