ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS (TABLES)

12 Months Ended

Dec. 31, 2012

ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS [Abstract]

Schedule of Accounts Receivable

		December 31,
		2012		2011
Accounts receivable		$	254,841	$	247,195
Less: Allowance for doubtful accounts			(3,635)		(3,559)
	Accounts receivable, net	$	251,206	$	243,636

Schedule of Change in Allowance for Doubtful Accounts

		December 31,
		2012		2011		2010
Balance, beginning of year		$	3,559	$	6,306	$	5,580
	Provision for doubtful accounts		368		363		600
	Uncollectible receivables written-off		(209)		(2,868)		(67)
	Effect of foreign currency		(83)		(242)		193
Balance, end of year		$	3,635	$	3,559	$	6,306

Schedule of Revenue from Significant Clients

	Year Ended December 31,
	2012		2011		2010
Telecommunications client		10%		9%		8%

Schedule of Accounts Receivable Outstanding from Significant Clients

Accounts receivable from this client was as follows (amounts in thousands):
	Year Ended December 31,
	2012		2011		2010
Telecommunications client	$	25,471	$	19,093	$	27,827