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SHAREHOLDERS’ EQUITY AND SHARE-BASED COMPENSATION - Summary of Activity related to our stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Number of options    
Outstanding at the beginning of the period (in shares) 1,440,566  
Exercised (in shares) (20,635)  
Forfeited (in shares) (153,289)  
Outstanding at the end of the period (in shares) 1,494,491 1,440,566
Exercisable at the end of the period (in shares) 945,826  
Weighted average exercise price    
Outstanding at the beginning of the period (in usd per share) $ 30.78  
Performance criteria achieved (in usd per share) 24.98  
Exercised (in usd per share) 18.79  
Forfeited (in usd per share) 39.68  
Outstanding at the end of the period (in usd per share) 29.15 $ 30.78
Exercisable at the end of the period (in usd per share) $ 26.45  
Weighted average contractual term (in years)    
Weighted average contractual term 4 years 8 months 27 days 5 years 14 days
Exercisable at the end of the period 3 years 1 month 24 days  
Aggregate intrinsic value (in thousands)    
Aggregate intrinsic value, beginning balance (in dollars) $ 945  
Aggregate intrinsic value, ending balance (in dollars) 257 $ 945
Exercisable at the end of the period (in dollars) $ 248