Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2016

Receivables [Abstract]

Schedule of Accounts Receivable

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

(in thousands)	June 30, 2016		December 31, 2015
Trade and other accounts receivable	$150,232		$123,179
Bank promissory notes	15,017		15,845
Revenue in excess of progress billings	19,326		15,889
Allowance for doubtful accounts	(8,239	)	(8,530	)
Total accounts receivable	$176,336		$146,383