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SHAREHOLDERS’ EQUITY AND SHARE-BASED COMPENSATION - Stock Repurchase Plan & Share-Based Compensation (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
May 15, 2018
$ / shares
shares
Apr. 03, 2018
Mar. 31, 2021
USD ($)
component
$ / shares
shares
Mar. 31, 2020
USD ($)
shares
Dec. 31, 2020
shares
Share Repurchase Program          
Authorized amount | $     $ 86,000    
Capacity available to repurchase common stock under senior secured term loan | $     398,000    
Share-Based Compensation          
Share-based compensation expense | $     1,438 $ 2,894  
Estimated unrecognized compensation costs | $     $ 7,700    
Weighted average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized     1 year 7 months 6 days    
Outstanding (in shares)     893,152   899,914
Stock options granted (in shares)     0 0  
Weighted average fair value of stock options granted and total intrinsic value of stock options exercised          
Grant date fair value of stock options that vested | $     $ 1,186 $ 1,650  
Revolving Credit Facility | April 3, 2018 Credit Agreement | Line of Credit          
Share Repurchase Program          
Leverage ratio at which mandatory prepayments increase under the Credit Agreement (exceeds)   3.50      
Stock Options, Service-Based          
Share-Based Compensation          
Outstanding (in shares)     249,000    
Stock Options, Service-Based | Minimum          
Share-Based Compensation          
Vesting period     3 years    
Stock Options, Service-Based | Maximum          
Share-Based Compensation          
Vesting period     4 years    
Expiration term     10 years    
Stock Options, Market-Based          
Share-Based Compensation          
Outstanding (in shares)     198,000    
Number of components of an award | component     2    
Allowable performance period before expiration date     3 years    
Stock Options, Market-Based | Minimum          
Share-Based Compensation          
Vesting period     3 years    
Expiration term     10 years    
Stock Options, Market-Based | Maximum          
Share-Based Compensation          
Vesting period     4 years    
Stock Options, Market-Based, Ordinary Performance          
Share-Based Compensation          
Percentage of awards     67.00%    
Vesting threshold     2    
Stock Options, Market-Based, Ordinary Performance | Minimum          
Share-Based Compensation          
Percentage of compounded annual gain of stock price over exercise price required for the award to vest     20.00%    
Stock Options, Market-Based, Extraordinary Performance          
Share-Based Compensation          
Percentage of awards     33.00%    
Stock Options, Market-Based, Extraordinary Performance | Minimum          
Share-Based Compensation          
Percentage of compounded annual gain of stock price over exercise price required for the award to vest     25.00%    
Stock Options, Performance-Based          
Share-Based Compensation          
Outstanding (in shares)     446,000    
Stock Options, Performance-Based | Share-based Payment Arrangement, Tranche One          
Share-Based Compensation          
Vesting percentage     25.00%    
Stock Options, Performance-Based | Share-based Payment Arrangement, Tranche Two          
Share-Based Compensation          
Vesting percentage     25.00%    
Stock Options, Performance-Based | Share-based Payment Arrangement, Tranche Three          
Share-Based Compensation          
Vesting percentage     25.00%    
Stock Options, Performance-Based | Share-based Payment Arrangement, Tranche Four          
Share-Based Compensation          
Vesting percentage     25.00%    
Stock Options, Performance-Based | Minimum          
Share-Based Compensation          
Allowable performance period before expiration date     10 years    
Attainment above threshold performance levels, vesting percentage     50.00%    
Stock Options, Performance-Based | Maximum          
Share-Based Compensation          
Attainment above threshold performance levels, vesting percentage     200.00%    
Restricted Stock and Restricted Stock Units, Service-Based          
Share-Based Compensation          
Restricted shares and restricted share units outstanding (in shares)     433,000    
Restricted Stock and Restricted Stock Units, Service-Based | Minimum          
Share-Based Compensation          
Vesting period     2 years    
Restricted Stock and Restricted Stock Units, Service-Based | Maximum          
Share-Based Compensation          
Vesting period     4 years    
Restricted Stock and Restricted Stock Units (RSUs), Performance-Based          
Share-Based Compensation          
Restricted shares and restricted share units outstanding (in shares)     252,000    
Restricted Stock and Restricted Stock Units (RSUs), Performance-Based | Share-based Payment Arrangement, Tranche One          
Share-Based Compensation          
Vesting percentage     33.00%    
Restricted Stock and Restricted Stock Units (RSUs), Performance-Based | Share-based Payment Arrangement, Tranche Two          
Share-Based Compensation          
Vesting percentage     33.00%    
Restricted Stock and Restricted Stock Units (RSUs), Performance-Based | Share-based Payment Arrangement, Tranche Three          
Share-Based Compensation          
Vesting percentage     33.00%    
Restricted Stock and Restricted Stock Units (RSUs), Performance-Based | Maximum          
Share-Based Compensation          
Attainment above threshold performance levels, vesting percentage     150.00%    
Restricted Stock and Restricted Stock Units (RSUs), Market-Based          
Share-Based Compensation          
Restricted shares and restricted share units outstanding (in shares)     176,000    
Restricted share units granted (in shares)     0 0  
Restricted Stock and Restricted Stock Units (RSUs), Market-Based | Minimum          
Share-Based Compensation          
Vesting period     30 days    
Vesting percentage     50.00%    
Restricted Stock and Restricted Stock Units (RSUs), Market-Based | Maximum          
Share-Based Compensation          
Vesting period     1 year    
Vesting percentage     50.00%    
Restricted Stock and Restricted Stock Units (RSUs), Performance-Based and Market-Based          
Share-Based Compensation          
Restricted shares and restricted share units outstanding (in shares)     96,000    
Restricted Stock and Restricted Stock Units (RSUs), Performance-Based and Market-Based | Maximum          
Share-Based Compensation          
Attainment above threshold performance levels, vesting percentage     300.00%    
Restricted Stock Units (RSUs)          
Share-Based Compensation          
Restricted share units granted (in shares)     338,000    
Restricted share units granted, weighted average grant date fair value (in usd per share) | $ / shares     $ 9.53    
Restricted Stock Units (RSUs), Performance-Based and Market-Based          
Share-Based Compensation          
Restricted share units granted (in shares)     29,000    
Restricted Stock Units (RSUs), Market-Based          
Share-Based Compensation          
Restricted share units granted (in shares)       37,000  
Share Repurchase Program, Current          
Share Repurchase Program          
Number of shares of common stock authorized to be purchased (in shares) 4,300,000        
Percentage of outstanding shares authorized to be repurchased 25.00%        
Minimum purchase price authorized (in usd per share) | $ / shares $ 1.00        
Maximum purchase price authorized (in usd per share) | $ / shares $ 500.00        
Period that shares may be repurchased, from the date of approval 5 years        
Remaining number of shares available for repurchase under the plan (in shares)     2,400,000    
Number of shares of common stock purchased (in shares)     0 0