Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2015

Accounts Receivable [Abstract]

Schedule of Accounts Receivable

(in thousands)	June 30, 2015			December 31, 2014
Trade and other accounts receivable	$	132,754		$	136,479
Bank promissory notes		18,563			17,426
Revenue in excess of progress billings		18,247			13,045
Allowance for doubtful accounts		(8,567	)		(8,713	)
Total accounts receivable	$	160,997		$	158,237