SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, FOREIGN CURRENCY AND ACCUMULATED OTHER COMPREHENSIVE LOSS, NET OF TAX (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Accounting Policies [Abstract]      
Material gains or losses from foreign currency transactions $ 0 $ 0  
Accumulated Other Comprehensive Loss Net of Tax [Abstract]      
Foreign currency translation adjustment (6,954)   (5,693)
Accumulated net unrealized loss on investments, net of tax (523)   (691)
Total accumulated other comprehensive loss (7,477)   (6,384)
Reclassification out of accumulated other comprehensive loss $ 0 $ 0