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SHAREHOLDERS' EQUITY (Status of the Company's Share Option Plans)(Details) (USD $)
12 Months Ended 236 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Share options        
Outstanding - beginning of year 1,575,814 1,631,072 1,827,862  
Granted 452,494 444,237 490,500  
Exercised 131,922 436,601 557,407 3,834,167
Cancelled 52,039 62,894 129,883 4,280,037
Outstanding - year end 1,844,347 1,575,814 1,631,072 1,844,347
Options exercisable at year-end 867,134 634,252 697,336 867,134
Weighted average exercise price        
Outstanding - beginning of year $ 4.84 $ 2.96 $ 1.99  
Granted $ 7.98 $ 8.81 $ 5.66  
Exercised $ 2.03 $ 2.12 $ 2.45  
Forfeited $ 7.1 $ 4.05 $ 1.73  
Outstanding - year end $ 5.75 $ 4.84 $ 2.96 $ 5.75
Options exercisable at year-end $ 3.86 $ 2.95 $ 2.23 $ 3.86