RECEIVABLES (Tables)

9 Months Ended

Sep. 30, 2016

Receivables [Abstract]

Summary of Accounts Receivable

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

	September 30, 2016			December 31, 2015
	(unaudited)
Trade accounts receivable	$	190,185		$	170,774
Unbilled revenues	80,750			47,098
Allowance for doubtful accounts	(6,432		)	(3,548		)
Total	$	264,503		$	214,324