RECEIVABLES (Tables)

3 Months Ended

Mar. 31, 2017

Receivables [Abstract]

Summary of Accounts Receivable

A summary of accounts receivable as of March 31, 2017 and December 31, 2016 is as follows (in thousands):

	March 31, 2017			December 31, 2016
	(unaudited)
Trade accounts receivable	$	193,572		$	230,889
Unbilled revenues	84,891			39,719
Allowance for doubtful accounts	(9,182		)	(7,835		)
Total	$	269,281		$	262,773