Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2018

Receivables [Abstract]

Schedule of Accounts Receivable

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

(in thousands)	December 31, 2018		December 31, 2017
Trade and other accounts receivable	$211,244		$152,375
Bank promissory notes	19,269		20,255
Revenue in excess of progress billings	-		37,964
Allowance for doubtful accounts	(7,337	)	(7,919	)
Total accounts receivable	$223,176		$202,675

Schedule of Noncurrent Receivables

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

(in thousands)	December 31, 2018	December 31, 2017
Noncurrent receivables	$45,061	$32,811