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FAIR VALUE MEASUREMENTS: (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Financial assets measured at fair value    
Financial liabilities $ 0  
Transfers between Level 1 and Level 2 0 $ 0
Fair Value, Measurements, Recurring Basis | Level 1    
Financial assets measured at fair value    
Financial assets 6,623 4,426
Fair Value, Measurements, Recurring Basis | Level 1 | Money market funds    
Financial assets measured at fair value    
Financial assets 6,623 4,426
Fair Value, Measurements, Recurring Basis | Level 2    
Financial assets measured at fair value    
Financial assets 397,530 334,038
Financial liabilities   3,562
Fair Value, Measurements, Recurring Basis | Level 2 | Certificates of deposits    
Financial assets measured at fair value    
Financial assets 103,895 80,275
Fair Value, Measurements, Recurring Basis | Level 2 | U.S. Government and agency securities    
Financial assets measured at fair value    
Financial assets 62,610 99,114
Fair Value, Measurements, Recurring Basis | Level 2 | Commercial paper    
Financial assets measured at fair value    
Financial assets 59,635 23,019
Fair Value, Measurements, Recurring Basis | Level 2 | Corporate bonds    
Financial assets measured at fair value    
Financial assets 127,018 111,736
Fair Value, Measurements, Recurring Basis | Level 2 | Municipal bonds    
Financial assets measured at fair value    
Financial assets 28,090 13,104
Fair Value, Measurements, Recurring Basis | Level 2 | Derivative contracts    
Financial assets measured at fair value    
Financial assets 2,186  
Financial liabilities   3,562
Fair Value, Measurements, Recurring Basis | Level 2 | Foreign government bonds    
Financial assets measured at fair value    
Financial assets 14,096 6,790
Fair Value, Measurements, Recurring Basis | Total    
Financial assets measured at fair value    
Financial assets 404,153 338,464
Financial liabilities   3,562
Fair Value, Measurements, Recurring Basis | Total | Money market funds    
Financial assets measured at fair value    
Financial assets 6,623 4,426
Fair Value, Measurements, Recurring Basis | Total | Certificates of deposits    
Financial assets measured at fair value    
Financial assets 103,895 80,275
Fair Value, Measurements, Recurring Basis | Total | U.S. Government and agency securities    
Financial assets measured at fair value    
Financial assets 62,610 99,114
Fair Value, Measurements, Recurring Basis | Total | Commercial paper    
Financial assets measured at fair value    
Financial assets 59,635 23,019
Fair Value, Measurements, Recurring Basis | Total | Corporate bonds    
Financial assets measured at fair value    
Financial assets 127,018 111,736
Fair Value, Measurements, Recurring Basis | Total | Municipal bonds    
Financial assets measured at fair value    
Financial assets 28,090 13,104
Fair Value, Measurements, Recurring Basis | Total | Derivative contracts    
Financial assets measured at fair value    
Financial assets 2,186  
Financial liabilities   3,562
Fair Value, Measurements, Recurring Basis | Total | Foreign government bonds    
Financial assets measured at fair value    
Financial assets $ 14,096 $ 6,790