LONG-TERM LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Other Liabilities Disclosure [Abstract]
Long-term deferred tax liabilities, net	$ 2,186	$ 1,754
Long-term deferred revenue	11,302	9,378
Long-term deferred rent	10,450	10,666
Long-term accrued restructuring	2,870	3,185
Long-term deferred compensation	2,896	2,902
Total long-term liabilities	$ 29,704	$ 27,885