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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 18, 2016
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
component
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
shares
Stock Repurchase Plan            
Capacity available to repurchase common stock under senior secured term loan (in dollars) | $   $ 379,000   $ 379,000    
Share-Based Compensation            
Share-based compensation expense (in dollars) | $   1,100 $ 1,900 4,700 $ 3,300  
Estimated unrecognized compensation costs (in dollars) | $   $ 7,300   $ 7,300    
Weighted average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized       2 years 2 months 23 days    
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 | $ / shares       $ 16.85 $ 12.62  
Intrinsic value of options exercised | $       $ 17,280 $ 232  
Grant date fair value of stock options that vested | $       $ 2,372 $ 1,195  
Minimum            
Share-Based Compensation            
Share-based compensation arrangement by share-based payment award, award vesting period       1 year    
Maximum            
Share-Based Compensation            
Share-based compensation arrangement by share-based payment award, award vesting period       4 years    
Employee and Non Employee Stock Option | Service-Based            
Share-Based Compensation            
Outstanding (in shares)   900,000   900,000    
Employee and Non Employee Stock Option | 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 Option | 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 Option | Market-Based            
Share-Based Compensation            
Expiration term       10 years    
Outstanding (in shares)   1,100,000   1,100,000    
Allowable performance period before expiration date       3 years    
Number of components of an award | component       2    
Employee and Non Employee Stock Option | 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 Option | 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 Option | Performance-Based            
Share-Based Compensation            
Outstanding (in shares)   100,000   100,000    
Vesting percentage for awards that vest upon achievement of certain criteria       25.00%    
Cumulative vesting percentage for awards that vest in equal annual installments       75.00%    
Employee and Non Employee Stock Option | Performance-Based | Minimum            
Share-Based Compensation            
Share-based compensation arrangement by share-based payment award, award vesting period       10 years    
Option            
Share-Based Compensation            
Outstanding (in shares)   2,080,047   2,080,047   3,163,125
Stock options granted (in shares)       142,654 729,900.0  
Weighted average exercise price of stock options granted (in usd per share) | $ / shares       $ 29.22 $ 23.19  
Share Repurchase Program, Current            
Stock Repurchase Plan            
Number of shares of common stock authorized to be purchased (in 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          
Remaining number of shares available for repurchase under the plan (in shares)   4,000,000   4,000,000    
Share Repurchase Programs            
Stock Repurchase Plan            
Number of shares of common stock purchased (in shares)   500,000 200,000 1,300,000 1,800,000  
Average purchase price per share (in usd per share) | $ / shares   $ 28.68 $ 26.88 $ 26.94 $ 27.90