Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2015

Accounts Receivable [Abstract]

Schedule of Accounts Receivable

(in thousands)	March 31, 2015			December 31, 2014
Trade and other accounts receivable	$	133,219		$	$136,479
Bank promissory notes		17,156			17,426
Revenue in excess of progress billings		20,909			13,045
Allowance for doubtful accounts		(7,875	)		(8,713	)
Total accounts receivable	$	163,409		$	$158,237