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STOCK-BASED COMPENSATION (Details - Stock Options Rollforward) (USD $)
6 Months Ended 0 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Stock options
Jun. 30, 2014
Director stock options
Jun. 30, 2014
Minimum
Stock options
Jun. 30, 2014
Maximum
Stock options
Aug. 06, 2014
Subsequent Event [Member]
Aug. 06, 2014
Subsequent Event [Member]
Stock options
Aug. 06, 2014
Subsequent Event [Member]
Tranche1
Stock options
Aug. 06, 2014
Subsequent Event [Member]
Tranche2
Stock options
STOCK-BASED COMPENSATION                  
Share Price $ 29.14         $ 26.59      
Award vesting rights percentage               25.00% 75.00%
Stock options, Shares                  
Outstanding at the beginning of the period (in shares)   1,038,999              
Granted (in shares)   104,910         1,000,000    
Exercised (in shares)   (4,534)              
Forfeited (in shares)   0              
Expired (in shares)   (669)              
Outstanding at the end of the period (in shares)   1,138,706              
Options exercisable at the end of the period (in shares)   983,795              
Stock options, Weighted Average Exercise Price                  
Outstanding at the beginning of the period (in dollars per share)   $ 8.98              
Granted (in dollars per share)   $ 27.95              
Exercised (in dollars per share)   $ 12.12              
Forfeited (in dollars per share)   $ 0.00              
Expired (in dollars per share)   $ 13.46              
Outstanding at the end of the period (in dollars per share)   $ 10.72              
Options exercisable at the end of the period (in dollars per share)   $ 9.04              
Stock options, Weighted Average Remaining Contractual Term                  
Outstanding at the end of the period   4 years 9 months 5 days              
Options exercisable at the end of the period   4 years 1 month 15 days              
Stock options, Aggregate Intrinsic Value                  
Outstanding at the end of the period   $ 21,171,000              
Options exercisable at the end of the period   19,771,000              
Stock options, Grant Date Fair Value Valuation                  
Grant date fair value     $ 13.08 $ 12.29 $ 17.13        
Expected term       P5Y9M P6Y        
Vesting period   3 years 2 years       2 years 6 months   3 years 6 months
Expected dividends   $ 0              
Expected dividend rate   0.00%              
Expected volatility, minimum   53.00%              
Expected volatility, maximum   54.00%              
Risk-free interest rate, minimum   1.85%              
Risk-free interest rate, maximum   1.97%