Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Schedule of Accounts Receivable

As of June 30, 2018 and December 31, 2017, Accounts receivable consisted of the following:

(in thousands)	June 30,  2018	December 31,  2017
Trade and other accounts receivable	$238,763	$152,375
Bank promissory notes	18,070	20,255
Revenue in excess of progress billings	-	37,964
Allowance for doubtful accounts	(7,351)	(7,919)
Total accounts receivable	$249,482	$202,675

Schedule of Contract Receivables

As of June 30, 2018 and December 31, 2017, Noncurrent receivables consisted of the following:

(in thousands)	June 30,  2018	December 31,  2017
Noncurrent receivables	$36,981	$32,811