DEFERRED REVENUE AND COSTS (DEFERRED COSTS 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 costs - current	$ 12,996	$ 8,574
Deferred costs - long-term	11,625	10,030
Total deferred costs	$ 24,621	$ 18,604	$ 4,733	$ 4,873