Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2017

Receivables [Abstract]

Schedule of Accounts Receivable

As of June 30, 2017 and December 31, 2016, Accounts receivable consisted of the following:

(in thousands)	June 30, 2017		December 31, 2016
Trade and other accounts receivable	$152,410		$146,460
Bank promissory notes	17,009		15,759
Revenue in excess of progress billings	30,664		15,926
Allowance for doubtful accounts	(7,018	)	(6,952	)
Total accounts receivable	$193,065		$171,193

Schedule of Contract Receivables

As of June 30, 2017 and December 31, 2016, Contract Receivables consisted of the following:

(in thousands)	June 30, 2017	December 31, 2016
Contract receivable	$21,581	$14,045