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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 9 Months Ended
May 17, 2017
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2018
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
component
$ / shares
shares
Sep. 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) | $   $ 477,000     $ 477,000          
Share-Based Compensation                    
Share-based compensation expense (in dollars) | $   2,000   $ 1,400 6,200 $ 3,200        
Estimated unrecognized compensation costs (in dollars) | $   $ 11,200     $ 11,200          
Weighted average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized         1 year 10 months 21 days          
Cumulative effect of accounting changes | $             $ (10,448)   $ 0  
Outstanding (in shares)   1,458,798     1,458,798     1,745,906    
Stock options granted (in shares)         271,876 216,000        
Weighted average exercise price of stock options granted (in usd per share) | $ / shares         $ 25.06 $ 34.07        
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 $ 20.95        
Intrinsic value of options exercised | $         $ 4,584 $ 2,524        
Grant date fair value of stock options that vested | $         $ 1,598 $ 2,063        
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)   518,000     518,000          
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)   659,000     659,000          
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%          
Restricted Stock                    
Equity And Share-Based Compensation                    
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Number of Non-Option Equity Instruments, Affected   31,000                
Restricted Stock | Service-Based | Minimum                    
Share-Based Compensation                    
Share-based compensation arrangement by share-based payment award, award vesting period         1 year          
Restricted Stock | Service-Based | Maximum                    
Share-Based Compensation                    
Share-based compensation arrangement by share-based payment award, award vesting period         4 years          
Restricted Stock | Performance-Based | Minimum                    
Share-Based Compensation                    
Attainment above threshold performance levels, vesting percentage         80.00%          
Restricted Stock | Performance-Based | Maximum                    
Share-Based Compensation                    
Attainment above threshold performance levels, vesting percentage         150.00%          
Restricted Stock | Performance-Based, Vesting Period One                    
Share-Based Compensation                    
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage         33.00%          
Restricted Stock | Performance-Based, Vesting Period Two                    
Share-Based Compensation                    
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage         33.00%          
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)   0   300,000 800,000 1,100,000        
Average purchase price per share (in usd per share) | $ / shares   $ 30.93   $ 23.48 $ 27.48 $ 22.48        
Luxembourg Law Limitation                    
Stock Repurchase Plan                    
Capacity available to repurchase common stock under senior secured term loan (in dollars) | $   $ 141,000     $ 141,000          
Retained earnings | Accounting Standards Update 2016-09                    
Share-Based Compensation                    
Cumulative effect of accounting changes | $                 $ (932)