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SHARE-BASED COMPENSATION (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based compensation      
Number of shares authorized 3,100,000    
Restricted Stock Units      
Award activity      
Outstanding at the beginning of the period (in shares) 1,313,550    
Granted (in shares) 536,440 269,660 232,450
Vested (in shares) (236,105)    
Forfeited (in shares) (136,348)    
Outstanding at the end of the period (in shares) 1,477,537 1,313,550  
Weighted-Average Grant Date Fair Value      
Granted (in dollars per share) $ 15.89 $ 35.50 $ 40.19
Other disclosure      
Fair value of restricted stock awards vested $ 5.8 $ 9.8 $ 9.4
Unrecognized compensation cost $ 16.4    
Weighted-average period of recognition of unrecognized compensation cost 2 years    
SARs      
Share-based compensation      
Granted to date (in shares) 0