INDEBTEDNESS (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Interest Rate Swap Expired August 2010 [Member]	Dec. 31, 2010 Interest Rate Swap Expired August 2010 [Member]	Dec. 31, 2007 Interest Rate Swap Expired August 2010 [Member]	Aug. 01, 2007 Interest Rate Swap Expired August 2010 [Member]	Dec. 31, 2010 Swap [Member]	Dec. 31, 2012 Base Rate Loans [Member]	Dec. 31, 2012 London Interbank Offered Rate Loans [Member]	Dec. 31, 2012 Revolving Credit Facility [Member]	Dec. 31, 2010 Revolving Credit Facility [Member]	Dec. 31, 2012 Line Of Credit Term A Loan [Member]	Dec. 31, 2010 Line Of Credit Term A Loan [Member]	Dec. 31, 2012 Credit Facility Accordion Feature [Member]	Dec. 31, 2012 Letter of Credit [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity											$ 250,000	$ 275,000	$ 50,000	$ 50,000	$ 75,000
Percentage of issued and outstanding stock pledged of foreign subsidiaries as collateral for credit facilty	65.00%
Applicable percentage									1.50%	2.50%
Interest rate at end of period										2.75%
Unused capacity, commitment fee percentage	0.40%
Borrowings on credit facility	178,062	192,885														5,500
Fixed interest rate in swap						4.75%	4.99%
Length of interest rate swaps				2 years
Modified length of interest rate swap				3 years
Unrealized gain on change in fair value of interest rate swaps recognized in other expense			1,228
Gain recognized in other comprehensive income, net of tax effect of $0.0 million, $0.0 million and $0.5 million in 2012, 2011 and 2010, respectively			1,009
Debt instrument, face amount					$ 100,000			$ 100,000