Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2016

Receivables [Abstract]

Schedule of Accounts Receivable

As of March 31, 2016 and December 31, 2015, Accounts receivable consisted of the following:

(in thousands)	March 31, 2016		December 31,  2015
Trade and other accounts receivable	$132,215		$123,179
Bank promissory notes	14,560		15,845
Revenue in excess of progress billings	12,569		15,889
Allowance for doubtful accounts	(8,523	)	(8,530	)
Total accounts receivable	$150,821		$146,383