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SHARE-BASED COMPENSATION: (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended
May 13, 2013
Stock Option and Equity Compensation Plans
Jun. 30, 2013
Stock Option and Equity Compensation Plans
May 23, 2013
Stock option and equity compensation plan terminated
Jun. 30, 2013
Stock options
Multiple
Share-based compensation        
Aggregate number of shares reserved for issuance under equity compensation plans since the inception of such plans   22,400,000    
Shares which remained available for future grants   1,900,000 1,700,000  
Additional shares authorized for issuance 4,000,000      
Granted (in shares)       301,508
Per-share weighted-average fair value of the stock options granted (in dollars per share)       $ 6.75
Pricing model used for share-based compensation arrangement       binomial lattice
Dividend yield (as a percent)       0.00%
Risk-free interest rate (as a percent)       2.00%
Expected option life       4 years 3 months 18 days
Expected volatility (as a percent)       35.00%
Suboptimal exercise multiple       1.3
Option Activity - Number of Shares        
Outstanding at the beginning of the period (in shares)       8,193,248
Granted (in shares)       301,508
Exercised (in shares)       (316,088)
Forfeited or cancelled (in shares)       (125,415)
Outstanding at the end of the period (in shares)       8,053,253
Exercisable at the end of the period (in shares)       6,813,217
Weighted-average exercise price per share        
Outstanding at the beginning of the period (in dollars per share)       $ 20.85
Granted (in dollars per share)       $ 21.46
Exercised (in dollars per share)       $ 15.43
Forfeited or cancelled (in dollars per share)       $ 31.37
Outstanding at the end of the period (in dollars per share)       $ 20.92
Exercisable at the end of the period (in dollars per share)       $ 21.92
Weighted-average remaining contractual term        
Outstanding at the end of the period       3 years 7 months 17 days
Exercisable at the end of the period       2 years 8 months 5 days
Aggregate intrinsic value        
Exercised       $ 2,292
Outstanding at the end of the period       32,715
Exercisable at the end of the period       $ 23,701