RECEIVABLES (Tables)

6 Months Ended

Jun. 30, 2016

Receivables [Abstract]

Summary of Accounts Receivable

A summary of accounts receivable as of June 30, 2016 and December 31, 2015 is as follows (in thousands):

	June 30, 2016			December 31, 2015
	(unaudited)
Trade accounts receivable	$	214,779		$	170,774
Unbilled revenues	73,284			47,098
Allowance for doubtful accounts	(5,739		)	(3,548		)
Total	$	282,324		$	214,324