INCOME TAXES (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
INCOME TAXES
Corporate statutory U.S. federal tax rate (as a percent)	35.00%	35.00%	35.00%
Reconciliation of the Company's provision for income tax and the statutory tax rate
Federal income tax provision (benefit) at statutory rate	$ (440)	$ 29	$ 11,131
U.S. state and local income taxes, net of federal tax benefit	(1,616)	(1,951)	(2,353)
U.S. valuation allowance	4,344	3,094
Foreign operations	(1,988)	(992)	(6,146)
Non-deductible expenses	1,643	1,991	2,045
U.S. tax on foreign profits	9,752		710
General business credit	(464)	(464)	(402)
(Decreases) increases in unrecognized tax benefits, net	(2,230)	(663)	1,077
Net adjustment related to the reconciliation of income tax provision (benefit) accruals to tax returns	(614)	1,428	(357)
Other		175	179
Provision for income taxes	8,387	2,647	5,884
Income tax expense from the exercise of stock options and vesting of RSUs recorded directly to additional paid-in capital	2,213	1,764	2,042
Unrecognized tax benefits (net of the federal benefit on state tax positions)	10,007
Accrued interest related to uncertain tax positions	1,050	834
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Unrecognized tax benefits balance at the beginning of the period, as previously reported	11,187	11,849	10,773
Gross increases-current period tax positions			1,076
Lapse of statute of limitations	(2,230)	(662)
Unrecognized tax benefits balance at the end of the period	$ 8,957	$ 11,187	$ 11,849