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SHARE-BASED COMPENSATION - RSUs and RSAs (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2018
shares
Dec. 31, 2018
USD ($)
installment
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Additional disclosures        
Share-based compensation expense | $   $ 7,895 $ 6,628 $ 5,073
Weighted average period to recognize compensation cost related to non-vested options not yet recognized   2 years 5 months 9 days    
Restricted Stock Units        
Number of Shares Subject to Restriction        
Outstanding at the beginning of the period (in shares)   66,639    
Granted (in shares)   2,059,066 90,718  
Vested and issued (in shares)   (183,263)    
Cancelled/expired (in shares)   (73,413) (24,079)  
Outstanding at the end of the period (in shares)   1,869,029 66,639  
Weighted Average Grant Date Fair Value        
Outstanding at the beginning of the period (in dollars per share) | $ / shares   $ 14.65    
Granted (in dollars per share) | $ / shares   22.00 $ 14.65  
Vested and issued (in dollars per share) | $ / shares   23.46    
Cancelled/expired (in dollars per share) | $ / shares   20.21 14.65  
Outstanding at the end of the period (in dollars per share) | $ / shares   $ 21.67 $ 14.65  
Additional disclosures        
Vesting period   3 years    
Share-based compensation expense | $   $ 9,634 $ 203  
Total compensation cost not yet recognized | $   $ 17,791    
Weighted average period to recognize compensation cost related to non-vested options not yet recognized   2 years 2 months 12 days    
Restricted Stock Units | Key employees        
Additional disclosures        
Vesting period   3 years    
Service-based awards, RSUs | Key employees        
Number of Shares Subject to Restriction        
Granted (in shares)   1,131,591 90,718  
Sign-on inducement award, RSUs | Executive        
Number of Shares Subject to Restriction        
Granted (in shares) 124,875      
Make-whole inducement award, RSUs | Executive        
Number of Shares Subject to Restriction        
Granted (in shares) 33,716      
Performance-based RSUs        
Additional disclosures        
Percentage of performance-based RSUs granted shares accounted will be earned   37.50%    
Percentage of performance-based RSUs granted shares accounted will be forfeited   62.50%    
Performance-based RSUs | Certain executives        
Number of Shares Subject to Restriction        
Granted (in shares)   139,512    
Additional disclosures        
Number of installments in which the award vest | installment   3    
Make-whole inducement award, performance-based RSUs | Executive        
Number of Shares Subject to Restriction        
Granted (in shares)   629,372    
Additional disclosures        
Number of installments in which the award vest | installment   3    
Sign-on inducement award, performance-based RSUs | Executive        
Additional disclosures        
Number of installments in which the award vest | installment   3    
Number of performance-based RSUs additional granted shares   1,498,500    
Restricted Stock Awards        
Number of Shares Subject to Restriction        
Outstanding at the beginning of the period (in shares)   34,291 5,765 10,805
Granted (in shares)   40,796 36,814 5,765
Vested and issued (in shares)   (31,732) (8,288) (10,805)
Outstanding at the end of the period (in shares)   43,355 34,291 5,765
Weighted Average Grant Date Fair Value        
Outstanding at the beginning of the period (in dollars per share) | $ / shares   $ 17.45 $ 32.97 $ 26.60
Granted (in dollars per share) | $ / shares   21.30 17.13 32.97
Vested and issued (in dollars per share) | $ / shares   17.68 26.80 26.60
Outstanding at the end of the period (in dollars per share) | $ / shares   $ 20.91 $ 17.45 $ 32.97
Additional disclosures        
Vesting period   1 year    
Share-based compensation expense | $   $ 643 $ 450 $ 339
Total compensation cost not yet recognized | $   $ 485