ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS (TABLES)

12 Months Ended

Dec. 31, 2014

ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS [Abstract]

Schedule of Accounts Receivable

		December 31,
		2014		2013
Accounts receivable		$	279,857	$	239,914
Less: Allowance for doubtful accounts			(3,425)		(3,815)
	Accounts receivable, net	$	276,432	$	236,099

Schedule of Change in Allowance for Doubtful Accounts

		December 31,
		2014		2013		2012
Balance, beginning of year		$	3,815	$	3,635	$	3,559
	Provision for doubtful accounts		633		695		368
	Uncollectible receivables written-off		(681)		(315)		(209)
	Effect of foreign currency		(342)		(200)		(83)
Balance, end of year		$	3,425	$	3,815	$	3,635

Schedule of Revenue from Significant Clients

	Year Ended December 31,
	2014		2013		2012
Telecommunications client		11%		12%		10%

Schedule of Accounts Receivable Outstanding from Significant Clients

Accounts receivable from this client was as follows (in thousands):
	Year Ended December 31,
	2014		2013		2012
Telecommunications client	$	38,400	$	24,120	$	25,471