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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 18, 2016
$ / shares
shares
Mar. 31, 2018
USD ($)
component
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Jan. 01, 2018
USD ($)
Dec. 31, 2017
shares
Jan. 01, 2017
USD ($)
Stock Repurchase Plan            
Capacity available to repurchase common stock under senior secured term loan (in dollars)   $ 464,000        
Share-Based Compensation            
Share-based compensation expense (in dollars)   2,200 $ 700      
Estimated unrecognized compensation costs (in dollars)   $ 16,900        
Weighted average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized   2 years 3 months 11 days        
Cumulative effect of accounting changes           $ 0
Outstanding (in shares) | shares   1,623,617     1,745,906  
Stock options granted (in shares) | shares   260,697 0      
Weighted average exercise price of stock options granted (in usd per share) | $ / shares   $ 24.95        
Weighted average fair value of stock options granted and total intrinsic value of stock options exercised            
Weighted average grant date fair value of stock options granted per share (in usd per share) | $ / shares   $ 16.20 $ 0.00      
Intrinsic value of options exercised   $ 4,320 $ 868      
Grant date fair value of stock options that vested   $ 23 $ 89      
Minimum            
Share-Based Compensation            
Share based compensation arrangement, estimated forfeiture rate   0.00%        
Maximum            
Share-Based Compensation            
Share based compensation arrangement, estimated forfeiture rate   40.00%        
Employee and non employee stock options | Service-Based            
Share-Based Compensation            
Outstanding (in shares) | shares   611,000        
Employee and non employee stock options | Service-Based | Minimum            
Share-Based Compensation            
Share-based compensation arrangement by share-based payment award, award vesting period   3 years        
Employee and non employee stock options | Service-Based | Maximum            
Share-Based Compensation            
Share-based compensation arrangement by share-based payment award, award vesting period   4 years        
Expiration term   10 years        
Employee and non employee stock options | Market-Based            
Share-Based Compensation            
Outstanding (in shares) | shares   707,000        
Allowable performance period before expiration date   3 years        
Number of components of an award | component   2        
Employee and non employee stock options | Market-Based | Minimum            
Share-Based Compensation            
Share-based compensation arrangement by share-based payment award, award vesting period   3 years        
Expiration term   10 years        
Employee and non employee stock options | Market-Based | Maximum            
Share-Based Compensation            
Share-based compensation arrangement by share-based payment award, award vesting period   4 years        
Employee and non employee 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%        
Employee and non employee 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%        
Employee and non employee stock options | Performance-Based            
Share-Based Compensation            
Outstanding (in shares) | shares   306,000        
Employee and non employee 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%        
Employee and non employee stock options | Performance-Based | Maximum            
Share-Based Compensation            
Attainment above threshold performance levels, vesting percentage   200.00%        
Employee and non employee stock options | Performance-Based, Vesting Period One            
Share-Based Compensation            
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage   25.00%        
Employee and non employee stock options | Performance-Based, Vesting Period Two            
Share-Based Compensation            
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage   25.00%        
Share Repurchase Program, Current            
Stock Repurchase Plan            
Number of shares of common stock authorized to be purchased (in shares) | shares 4,600,000.0          
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) | shares   3,100,000        
Share Repurchase Programs            
Stock Repurchase Plan            
Number of shares of common stock purchased (in shares) | shares   400,000 400,000      
Average purchase price per share (in usd per share) | $ / shares   $ 27.67 $ 25.10      
Luxembourg Law Limitation            
Stock Repurchase Plan            
Capacity available to repurchase common stock under senior secured term loan (in dollars)   $ 141,000        
Retained earnings            
Share-Based Compensation            
Cumulative effect of accounting changes       $ (9,715)    
Retained earnings | Accounting Standards Update 2016-09            
Share-Based Compensation            
Cumulative effect of accounting changes           $ (932)