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SHARE-BASED COMPENSATION: (Details)
$ / shares in Units, $ in Thousands
9 Months Ended
May. 08, 2015
shares
Dec. 31, 2015
USD ($)
multiple
$ / shares
shares
Dec. 31, 2014
USD ($)
Aug. 18, 2015
shares
Stock Option Activity - Number of Shares        
Outstanding at the beginning of the period (in shares)   4,870,219    
Granted (in shares)   445,785    
Exercised (in shares)   (625,256)    
Forfeited or cancelled (in shares)   (781,791)    
Outstanding at the end of the period (in shares)   3,908,957    
Exercisable at the end of the period (in shares)   2,678,043    
Weighted-average exercise price per share        
Outstanding at the beginning of the period (in dollars per share) | $ / shares   $ 15.10    
Granted (in dollars per share) | $ / shares   17.84    
Exercised (in dollars per share) | $ / shares   8.63    
Forfeited or cancelled (in dollars per share) | $ / shares   27.11    
Outstanding at the end of the period (in dollars per share) | $ / shares   14.04    
Exercisable at the end of the period (in dollars per share) | $ / shares   $ 14.27    
Weighted-average remaining contractual term        
Outstanding at the end of the period   5 years 1 month 10 days    
Exercisable at the end of the period   3 years 8 months 5 days    
Aggregate intrinsic value        
Exercised | $   $ 7,048    
Outstanding at the end of the period | $   28,178    
Exercisable at the end of the period | $   $ 18,885    
Stock Option and Equity Compensation Plans        
Share-based compensation        
Aggregate number of shares reserved for issuance under equity compensation plans since the inception of such plans (in shares)   24,800,000   28,900,000
Shares which remained available for future grants (in shares)   5,500,000    
Additional number of shares reserved for issuance under equity compensation plans (in shares) 4,100,000      
Stock options        
Share-based compensation        
Granted (in shares)   445,785    
Per-share weighted-average fair value of the stock options granted (in dollars per share) | $ / shares   $ 6.48    
Pricing model used for share-based compensation arrangement   binomial lattice    
Dividend yield (as a percent)   0.00%    
Risk-free interest rate (as a percent)   2.20%    
Expected option life   4 years 6 months    
Expected volatility (as a percent)   40.00%    
Suboptimal exercise multiple | multiple   1.4    
Share-based compensation expense | $   $ 8,000 $ 7,000  
Future share-based compensation expense expected | $   $ 11,400    
Period for recognition of unrecognized stock-based compensation expense   4 years