Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2014

Accounts Receivable [Abstract]

Schedule of Accounts Receivable

The components of Accounts receivable are summarized below:

(in thousands)	June 30, 2014	December 31, 2013
Trade accounts receivable	$147,304	$154,296
Revenue in excess of progress billings	11,046	20,525
Less: allowance for doubtful accounts	(9,877)	(11,274)
Total Accounts Receivable	$148,473	$163,547