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SHARE-BASED COMPENSATION - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 02, 2018
Jan. 01, 2016
Oct. 31, 2014
Additional disclosures              
Deferred tax asset $ 7,850 $ 13,100          
(Accumulated deficit) retained earnings (210,579) 91,816     $ 91,690    
Income tax benefit (expense) $ 5,039 7,126 $ (11,195)        
2007 Stock Option Plan              
Additional disclosures              
Number of shares reserved for issuance (in shares) 0            
Number of anniversary dates upon which options become exercisable 3 years            
Percentage of options exercisable in installments beginning on the first anniversary of the grant date and each of the three anniversaries thereafter 25.00%            
2014 Plan              
Additional disclosures              
Number of shares reserved for issuance (in shares)             4,000,000
Increase to number of shares available for issuance (as a percent)             2.00%
ASU 2016-09              
Additional disclosures              
Deferred tax asset           $ 16,903  
(Accumulated deficit) retained earnings           $ 16,903  
Income tax benefit (expense) $ 80 $ 3,003 $ 4,148        
Stock Options              
Number of Options              
Outstanding at beginning of period (in shares) 6,108,292 4,413,341 4,114,685        
Granted (in shares) 411,486 4,066,735 1,546,532        
Exercised (in shares) (379,194) (1,217,320) (564,844)        
Cancelled/expired (in shares) (954,559) (1,154,464) (683,032)        
Outstanding at end of period (in shares) 5,186,025 6,108,292 4,413,341 4,114,685      
Exercisable at end of period (in shares) 2,011,169            
Weighted Average Exercise Price              
Outstanding at beginning of period (in dollars per share) $ 18.62 $ 19.02 $ 17.53        
Granted (in dollars per share) 21.39 16.43 22.64        
Exercised (in dollars per share) 10.81 6.47 7.87        
Cancelled/expired (in dollars per share) 24.13 25.25 27.41        
Outstanding at end of period (in dollars per share) 18.42 $ 18.62 $ 19.02 $ 17.53      
Exercisable at end of period (in dollars per share) $ 18.35            
Weighted Average Remaining Contractual Life              
Outstanding (in years) 8 years 8 years 6 months 7 years 7 years 8 months 12 days      
Exercisable (in years) 7 years 1 month 6 days            
Aggregate Intrinsic Value              
Outstanding at end of period $ 2,910 $ 25,777 $ 11,558 $ 76,567      
Exercisable at end of period $ 2,910