Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2014

Accounts Receivable [Abstract]

Schedule of Accounts Receivable

The components of Accounts receivable are summarized below:

(in thousands)	March 31, 2014		December 31, 2013
Trade accounts receivable	$152,120		$154,296
Revenue in excess of progress billings	10,680		20,525
Less: allowance for doubtful accounts	(10,427	)	(11,274	)
Total Accounts Receivable	$152,373		$163,547