LONG-TERM LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Other Liabilities Disclosure [Abstract]
Long-term deferred tax liabilities, net	$ 1,779	$ 1,754
Long-term deferred revenue	10,670	9,378
Long-term deferred rent	10,741	10,666
Long-term accrued restructuring	2,914	3,185
Long-term deferred compensation	3,017	2,902
Total long-term liabilities	$ 29,121	$ 27,885