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DEFERRED REVENUE AND COSTS (DEFERRED REVENUE CLASSIFICATION TABLE) (DETAILS) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
DEFERRED REVENUE AND COSTS [ABSTRACT]        
Deferred revenue - current $ 26,892 $ 15,895    
Deferred revenue - long-term 21,880 13,976    
Total deferred revenue $ 48,772 $ 29,871 $ 8,550 $ 15,667