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EMPLOYEE BENEFIT PLANS - Range of Exercise Prices (Details) - Stock Options
9 Months Ended
Sep. 30, 2016
$ / shares
shares
Options Outstanding  
Number of Options Outstanding (in shares) | shares 1,442,671
Weighted Average Remaining Contractual life 2 years 4 months 24 days
Weighted Average Exercise Price (in dollars per share) $ 22.79
Options Exercisable  
Number of Options Exercisable (in shares) | shares 1,442,671
Weighted Average Exercise Price (in dollars per share) $ 22.79
Range of Exercise Prices, $0.00 to $4.569  
Summary information about outstanding stock options  
Exercise price per share, low end of the range (in dollars per share) 0.00
Exercise price per share, high end of the range (in dollars per share) $ 4.569
Options Outstanding  
Number of Options Outstanding (in shares) | shares 178,969
Weighted Average Remaining Contractual life 2 years 4 months 24 days
Weighted Average Exercise Price (in dollars per share) $ 4.56
Options Exercisable  
Number of Options Exercisable (in shares) | shares 178,969
Weighted Average Exercise Price (in dollars per share) $ 4.56
Range of Exercise Prices, $4.57 to $25.089  
Summary information about outstanding stock options  
Exercise price per share, low end of the range (in dollars per share) 4.57
Exercise price per share, high end of the range (in dollars per share) $ 25.089
Options Outstanding  
Number of Options Outstanding (in shares) | shares 827,315
Weighted Average Remaining Contractual life 3 years 1 month 6 days
Weighted Average Exercise Price (in dollars per share) $ 20.85
Options Exercisable  
Number of Options Exercisable (in shares) | shares 827,315
Weighted Average Exercise Price (in dollars per share) $ 20.85
Range of Exercise Prices, $25.09 to $32.569  
Summary information about outstanding stock options  
Exercise price per share, low end of the range (in dollars per share) 25.09
Exercise price per share, high end of the range (in dollars per share) $ 32.569
Options Outstanding  
Number of Options Outstanding (in shares) | shares 182,000
Weighted Average Remaining Contractual life 4 months 24 days
Weighted Average Exercise Price (in dollars per share) $ 26.40
Options Exercisable  
Number of Options Exercisable (in shares) | shares 182,000
Weighted Average Exercise Price (in dollars per share) $ 26.40
Range of Exercise Prices, $32.57 to $42.529  
Summary information about outstanding stock options  
Exercise price per share, low end of the range (in dollars per share) 32.57
Exercise price per share, high end of the range (in dollars per share) $ 42.529
Options Outstanding  
Number of Options Outstanding (in shares) | shares 254,387
Weighted Average Remaining Contractual life 1 year 4 months 24 days
Weighted Average Exercise Price (in dollars per share) $ 39.31
Options Exercisable  
Number of Options Exercisable (in shares) | shares 254,387
Weighted Average Exercise Price (in dollars per share) $ 39.31