LONG-TERM LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Other Liabilities Disclosure [Abstract]
Long-term deferred tax liabilities, net	$ 2,218	$ 1,754
Long-term deferred revenue	13,249	9,378
Long-term deferred rent	9,660	10,666
Long-term accrued restructuring	8,478	3,185
Long-term deferred compensation	2,976	2,902
Total long-term liabilities	$ 36,581	$ 27,885