TRADE ACCOUNTS RECEIVABLE, NET OF ALLOWANCE (Tables)

3 Months Ended

Mar. 31, 2014

Schedule of Unbilled Trade Accounts Receivable

(in thousands)	March 31,             2014		December 31,             2013
Trade accounts receivable	$	80,084	$	129,007
Unbilled trade accounts receivable		30,329		38,618
Total accounts receivable		110,413		167,625
Allowance for sales credit memos		(1,762)		(1,997)
	$	108,651	$	165,628