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SHARE-BASED COMPENSATION (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based compensation      
Number of shares authorized 3,100,000    
Restricted Stock Units      
Award activity      
Outstanding at the beginning of the period (in shares) 1,477,537    
Granted (in shares) 504,550 536,440 269,660
Vested (in shares) (438,018)    
Forfeited (in shares) (84,809)    
Outstanding at the end of the period (in shares) 1,459,260 1,477,537  
Weighted-Average Grant Date Fair Value      
Outstanding at the beginning of the period (in dollars per share) $ 23.88    
Granted (in dollars per share) 16.39 $ 15.89 $ 35.50
Vested (in dollars per share) 18.27    
Forfeited (in dollars per share) 23.88    
Outstanding at the end of the period (in dollars per share) $ 22.98 $ 23.88  
Other disclosure      
Fair value of restricted stock awards vested $ 11.2 $ 5.8 $ 9.8
Unrecognized compensation cost $ 16.3    
Weighted-average period of recognition of unrecognized compensation cost 2 years 9 months    
SARs      
Share-based compensation      
Granted to date (in shares) 0