Accounts Receivable (Tables)

9 Months Ended

Sep. 30, 2016

Receivables [Abstract]

Schedule of Accounts Receivable

As of September 30, 2016 and December 31, 2015, Accounts receivable consisted of the following:

(in thousands)	September 30, 2016		December 31,  2015
Trade and other accounts receivable	$149,403		$123,179
Bank promissory notes	17,293		15,845
Revenue in excess of progress billings	11,626		15,889
Allowance for doubtful accounts	(7,583	)	(8,530	)
Total accounts receivable	$170,739		$146,383