TRADE ACCOUNTS RECEIVABLE, NET OF ALLOWANCE (Tables)

6 Months Ended

Jun. 30, 2015

Schedule of Trade Accounts Receivable

(in thousands)	June 30, 2015			December 31, 2014
Trade accounts receivable	$	122,210		$	128,757
Unbilled trade accounts receivable		15,127			27,627
Total accounts receivable		137,337			156,384
Allowance for sales credit memos		(1,752	)		(1,540	)
	$	135,585		$	154,844