Accounts Receivable (Tables)

9 Months Ended

Sep. 30, 2015

Accounts Receivable [Abstract]

Schedule of Accounts Receivable

(in thousands)	September 30, 2015			December 31, 2014
Trade and other accounts receivable	$	132,749		$	136,479
Bank promissory notes		15,858			17,426
Revenue in excess of progress billings		12,134			13,045
Allowance for doubtful accounts		(8,833	)		(8,713	)
Total accounts receivable	$	151,908		$	158,237