Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Schedule of Accounts Receivable

As of March 31, 2018 and December 31, 2017, Accounts receivable consisted of the following:

(in thousands)	March 31, 2018		December 31, 2017
Trade and other accounts receivable	$237,767		$152,375
Bank promissory notes	18,865		20,255
Revenue in excess of progress billings	-		37,964
Allowance for doubtful accounts	(8,094	)	(7,919	)
Total accounts receivable	$248,538		$202,675

Schedule of Contract Receivables

As of March 31, 2018 and December 31, 2017, Noncurrent receivables consisted of the following:

(in thousands)	March 31, 2018	December 31, 2017
Noncurrent receivables	$35,338	$32,811