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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 6 Months Ended
May 17, 2017
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
component
$ / shares
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Jan. 01, 2018
USD ($)
Dec. 31, 2017
shares
Jan. 01, 2017
USD ($)
Dec. 31, 2016
Stock Repurchase Plan                  
Capacity available to repurchase common stock under senior secured term loan (in dollars) | $   $ 456,000   $ 456,000          
Share-Based Compensation                  
Share-based compensation expense (in dollars) | $   1,900 $ 1,200 4,100 $ 1,900        
Estimated unrecognized compensation costs (in dollars) | $   $ 14,500   $ 14,500          
Weighted average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized       2 years 1 month 13 days          
Cumulative effect of accounting changes | $           $ (10,448)   $ 0  
Outstanding (in shares)   1,541,452   1,541,452     1,745,906    
Stock options granted (in shares)       271,876 129,000        
Weighted average exercise price of stock options granted (in usd per share) | $ / shares       $ 25.06 $ 39.13        
Plan modification, number of stock options affected   263,000              
Plan modification, number of employees affected   16              
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       $ 16.27 $ 24.23        
Intrinsic value of options exercised | $       $ 4,393 $ 875        
Grant date fair value of stock options that vested | $       $ 1,334 $ 1,693        
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)   575,000   575,000          
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)   684,000   684,000          
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)   282,000   282,000          
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) 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)   4,200,000   4,200,000          
Share Repurchase Programs                  
Stock Repurchase Plan                  
Number of shares of common stock purchased (in shares)   400,000 400,000 800,000 800,000        
Average purchase price per share (in usd per share) | $ / shares   $ 27.14 $ 19.17 $ 27.39 $ 22.15        
Luxembourg Law Limitation                  
Stock Repurchase Plan                  
Capacity available to repurchase common stock under senior secured term loan (in dollars) | $   $ 142,000   $ 142,000          
Retained earnings | Accounting Standards Update 2016-09                  
Share-Based Compensation                  
Cumulative effect of accounting changes | $               $ (932)