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STOCK COMPENSATION - Performance Stock Unit Awards (Details) - Certain executives - $ / shares
shares in Thousands
1 Months Ended 12 Months Ended
May 31, 2016
Aug. 31, 2015
Dec. 31, 2016
TSR Awards | Monte Carlo valuation method      
Grant-date valuations      
Expected life (in years) 2 years 1 month 28 days 2 years 10 months 24 days  
Expected Volatility (as a percent) 69.69% 43.63%  
Risk-free interest rate (as a percent) 0.77% 1.06%  
Dividend yield (as a percent)   0.95%  
Fair value of underlying common stock $ 18.50 $ 42.00  
PSU Awards      
Employee awards      
Award vesting period     3 years
Stock-Settled PSU awards      
Roll-forward of stock awards other than options      
Unvested, beginning of year (in shares)     322
Vested (in shares)     (118)
Forfeited (in shares)     (21)
Converted to stock-settled awards (in shares)     276
Unvested, end of year (in shares)     459
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)     $ 77.80
Vested, weighted-average grant-date fair value (in dollars per share)     77.26
Forfeited, weighted-average grant-date fair value (in dollars per share)     51.40
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)     $ 44.34
Cash-Settled PSU awards      
Roll-forward of stock awards other than options      
Unvested, beginning of year (in shares)     279
Forfeited (in shares)     (3)
Converted to stock-settled awards (in shares)     (276)
Unvested, end of year (in shares)