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STOCK-BASED COMPENSATION, Stock-Based Compensation - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 11, 2012
May. 31, 2006
Jun. 30, 2015
Jun. 30, 2015
Jun. 11, 2015
Dec. 31, 2014
Compensation Related Costs Share Based Payments Disclosure [Line Items]            
Options granted       2,083,700    
Underlying options, in shares     9,325 9,325    
Stock Options            
Compensation Related Costs Share Based Payments Disclosure [Line Items]            
Unrecognized compensation cost, net of forfeitures     $ 74,727 $ 74,727    
Weighted average remaining contractual term, exercisable       5 years 10 months 5 days    
Weighted average remaining contractual term, outstanding       8 years 10 months 13 days    
Total unrecognized compensation cost related to non-vested share-based compensation awards granted, period for recognition       2 years 6 months 18 days    
Restricted Stock            
Compensation Related Costs Share Based Payments Disclosure [Line Items]            
Stock options issued (in shares)       63,295    
Underlying service-based awards, unvested and outstanding (in shares)     541,135 541,135   633,442
Service-Based Awards            
Compensation Related Costs Share Based Payments Disclosure [Line Items]            
Total unrecognized compensation cost related to non-vested share-based compensation awards granted     $ 13,643 $ 13,643    
Total unrecognized compensation cost related to non-vested share-based compensation awards granted, period for recognition       1 year 11 months 5 days    
Underlying service-based awards, unvested and outstanding (in shares)     427,293 427,293    
Underlying options, value at grant date       $ 16,137    
Performance-Based Awards            
Compensation Related Costs Share Based Payments Disclosure [Line Items]            
Total unrecognized compensation cost related to non-vested share-based compensation awards granted     $ 16,061 $ 16,061    
Total unrecognized compensation cost related to non-vested share-based compensation awards granted, period for recognition       1 year 11 months 24 days    
Stock options issued (in shares)       14,000    
Underlying service-based awards, unvested and outstanding (in shares)     250,940 250,940   371,510
2105 Plan            
Compensation Related Costs Share Based Payments Disclosure [Line Items]            
Shares authorized for issuance (in shares)         4,000,000  
Common stock shares available for issuance (in shares)     6,765,334 6,765,334    
2012 Directors Plan            
Compensation Related Costs Share Based Payments Disclosure [Line Items]            
Shares authorized for issuance (in shares) 600,000          
2012 Directors Plan expiration period 10 years          
Common stock shares available for issuance (in shares)     554,070 554,070    
2012 Directors Plan | Restricted Stock            
Compensation Related Costs Share Based Payments Disclosure [Line Items]            
Non-vested common stock shares issued (in shares)     5,295 5,295    
Total unrecognized compensation cost related to non-vested share-based compensation awards granted     $ 492 $ 492    
Total unrecognized compensation cost related to non-vested share-based compensation awards granted, period for recognition       1 year 7 months 26 days    
2012 Plan            
Compensation Related Costs Share Based Payments Disclosure [Line Items]            
Common stock shares subject to outstanding awards that expire or terminate that are available for awards to be granted (in shares)     6,564,714 6,564,714    
2012 Plan | Stock Options            
Compensation Related Costs Share Based Payments Disclosure [Line Items]            
Options granted       2,083,700    
Options issued expiration period 10 years          
Aggregate grant-date fair value of stock options       $ 44,394    
2012 Plan | Restricted Stock Units (RSUs)            
Compensation Related Costs Share Based Payments Disclosure [Line Items]            
Total unrecognized compensation cost related to non-vested share-based compensation awards granted     $ 4,647 $ 4,647    
Total unrecognized compensation cost related to non-vested share-based compensation awards granted, period for recognition       2 years 8 months 19 days    
Vesting percentage       25.00%    
2012 Plan | Restricted Stock Units (RSUs) | Performance Targets            
Compensation Related Costs Share Based Payments Disclosure [Line Items]            
Deferred compensation, shares issued       14,000    
Deferred compensation arrangement, fair value of shares issued       $ 983    
2012 Plan | Restricted Stock Units (RSUs) | Service Period            
Compensation Related Costs Share Based Payments Disclosure [Line Items]            
Deferred compensation, shares issued     0 58,000    
Deferred compensation arrangement, fair value of shares issued       $ 3,560    
2006 Plan            
Compensation Related Costs Share Based Payments Disclosure [Line Items]            
Common stock shares subject to outstanding awards that expire or terminate that are available for awards to be granted (in shares)     1,371,535 1,371,535    
2006 Plan | Stock Options            
Compensation Related Costs Share Based Payments Disclosure [Line Items]            
Options issued expiration period   10 years