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STOCK COMPENSATION - Restricted Stock (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
RSUs    
Employee awards    
Award vesting period 3 years  
RSUs | Minimum    
Employee awards    
Award vesting period 2 years  
RSUs | Maximum    
Employee awards    
Award vesting period 3 years  
RSUs | Non-employee directors    
Employee awards    
Award vesting period 1 year 1 year
Roll-forward of stock awards other than options    
Granted (in shares) 76,788 15,375
PSU Awards | Minimum    
Employee awards    
Award vesting period 2 years  
PSU Awards | Maximum    
Employee awards    
Award vesting period 3 years  
Stock-Settled RSUs    
Roll-forward of stock awards other than options    
Unvested, beginning of year (in shares) 132,000  
Granted (in shares) 453,000  
Vested (in shares) (121,000)  
Forfeited (in shares) (24,000)  
Converted to stock-settled awards (in shares) 165,000  
Unvested, end of year (in shares) 605,000 132,000
Stock awards other than options weighted-average grant-date fair value (in dollars per share)    
Unvested, beginning of year, weighted-average grant-date fair value (in dollars per share) $ 79.39  
Granted, weighted-average grant-date fair value (in dollars per share) 15.40  
Vested, weighted-average grant-date fair value (in dollars per share) 62.04  
Forfeited, weighted-average grant-date fair value (in dollars per share) 52.66  
Converted to stock-settled awards, weighted-average grant-date fair value (in dollars per share) 18.50  
Unvested, end of year, weighted-average grant-date fair value (in dollars per share) $ 22.08 $ 79.39
Cash-Settled RSUs    
Roll-forward of stock awards other than options    
Unvested, beginning of year (in shares) 904,000  
Granted (in shares) 1,273,000  
Vested (in shares) (344,000)  
Forfeited (in shares) (88,000)  
Converted to stock-settled awards (in shares) (165,000)  
Unvested, end of year (in shares) 1,580,000 904,000