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STOCK-BASED COMPENSATION - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted stock and performance-based restricted stock units      
Other disclosures      
Unrecognized stock-based compensation expense related to non-vested stock $ 19.4    
Weighted- average period over which unrecognized stock-based compensation cost will be expensed 2 years 4 months 24 days    
Restricted stock units      
Units      
Vested (in units) (400,000) (400,000) (400,000)
Other disclosures      
Intrinsic value of shares fully vested during the period $ 5.9 $ 2.1 $ 9.0
Total estimated grant date fair values $ 17.7 $ 6.2 $ 16.1
Restricted stock units | Employee Awards      
Units      
Nonvested at the beginning of the year (in units) 1,066,598 810,840  
Granted (in units) 555,280 631,011  
Vested (in units) (363,834) (279,421)  
Forfeited (in units) (75,005) (95,832)  
Nonvested at the end of the year (in units) 1,183,039 1,066,598 810,840
Weighted Average Grant Date Fair Value      
Nonvested at the beginning of the year (in dollars per unit) $ 16.30 $ 26.90  
Granted (in dollars per unit) 13.74 6.90  
Vested (in dollars per unit) 19.27 26.64  
Forfeited (in dollars per unit) 14.58 20.69  
Nonvested at the end of the year (in dollars per unit) $ 14.30 $ 16.30 $ 26.90
Restricted stock units | Director Awards      
Units      
Nonvested at the beginning of the year (in units) 71,465 94,169  
Granted (in units) 98,406 71,000  
Vested (in units) (71,465) (93,704)  
Nonvested at the end of the year (in units) 98,406 71,465 94,169
Weighted Average Grant Date Fair Value      
Nonvested at the beginning of the year (in dollars per unit) $ 6.72 $ 18.25  
Granted (in dollars per unit) 12.66 6.53  
Vested (in dollars per unit) 6.72 18.16  
Nonvested at the end of the year (in dollars per unit) $ 12.66 $ 6.72 $ 18.25
Performance-based stock awards | Employee Awards      
Units      
Nonvested at the beginning of the year (in units) 125,729 145,451  
Granted (in units) 512,458 192,600  
Vested (in units) (5,551) (19,722)  
Forfeited (in units)   (192,600)  
Nonvested at the end of the year (in units) 632,636 125,729 145,451
Weighted Average Grant Date Fair Value      
Nonvested at the beginning of the year (in dollars per unit) $ 26.11 $ 25.83  
Granted (in dollars per unit) 17.21 6.90  
Vested (in dollars per unit) 29.66 23.99  
Forfeited (in dollars per unit)   6.90  
Nonvested at the end of the year (in dollars per unit) $ 18.87 $ 26.11 $ 25.83