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STOCK-BASED COMPENSATION - SUMMARY OF RESTRICTED STOCK UNITS AND PERFORMANCE-BASED AWARDS (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Unvested, Shares 149,320 114,520  
Granted 91,768    
Vested in Period 0    
Forfeited in Period (56,968)    
Unvested, Weighted Average Fair Value $ 60.36 $ 76.48  
Granted, Weighted Average Fair Value 47.00    
Vested in Period, Weighted Average Fair Value 0.00    
Forfeited in Period, Weighted Average Fair Value $ 71.25    
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Unvested, Shares 257,096 175,411  
Granted 162,256    
Vested in Period (60,015)    
Forfeited in Period (20,556)    
Unvested, Weighted Average Fair Value $ 57.47 $ 74.52  
Granted, Weighted Average Fair Value 44.45 $ 69.05 $ 85.32
Vested in Period, Weighted Average Fair Value 72.41    
Forfeited in Period, Weighted Average Fair Value $ 59.15    
Share-based Compensation Award, Tranche One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Unvested, Shares 74,660