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, 2015
Dec. 31, 2014
Dec. 31, 2013
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) 903,441 883,895 825,650
Granted (in shares) 434,387 374,683 355,795
Vested (Earned/Released) (in shares) (318,651) (256,137) (215,850)
Forfeited (in shares) [1] (135,470) (99,000) (81,700)
Outstanding at end of year (in shares) 883,707 903,441 883,895
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) $ 37.51 $ 32.22 $ 25.43
Granted (in dollars per share) 40.48 45.23 42.78
Vested (Earned/Released) (in dollars per share) 41.14 45.34 41.72
Forfeited (in dollars per share) [1] 40.53 38.77 31.27
Outstanding at end of year (in dollars per share) $ 40.75 $ 37.51 $ 32.22
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) 170,833 175,000 180,000
Granted (in shares) 66,187 52,083 62,500
Vested (Earned/Released) (in shares) (56,250) (56,250) (67,500)
Forfeited (in shares) [1] 0 0 0
Outstanding at end of year (in shares) 180,770 170,833 175,000
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) $ 35.43 $ 30.10 $ 22.81
Granted (in dollars per share) 41.17 45.60 42.56
Vested (Earned/Released) (in dollars per share) 40.34 45.56 41.97
Outstanding at end of year (in dollars per share) $ 42.93 $ 35.43 $ 30.10
[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 management group's compensation agreements.