Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2013

Accounts Receivable [Abstract]

Schedule of Accounts Receivable

The components of Accounts receivable are summarized below:

(in thousands)	March 31, 2013		December 31, 2012
Trade accounts receivable	$151,141		$149,737
Revenue in excess of progress billings	15,365		17,105
Receivables related to the sale of discontinued businesses	16,675		16,555
Less: allowance for doubtful accounts	(11,698	)	(11,862	)
Total Accounts Receivable	$171,483		$171,535