Consolidated Statement of Cash Flows (Tables)

12 Months Ended

Dec. 31, 2017

Consolidated Statement of Cash Flows [Abstract]

Changes in Other Components of Working Capital

	Year Ended December 31,
(in thousands)	2017		2016		2015
(Increase) Decrease in:
Accounts receivable	$	(57,609)	$	(269,900)	$	4,734
Costs and estimated earnings in excess of billings		(100,932)		73,349		(178,774)
Other current assets		(19,718)		39,480		(38,616)
(Decrease) Increase in:
Accounts payable		(32,225)		56,552		139,290
Billings in excess of costs and estimated earnings		125,757		42,926		(30,985)
Accrued expenses		24,513		(32,937)		(24,426)
Changes in other components of working capital	$	(60,214)	$	(90,530)	$	(128,777)
Cash paid during the year for:
Interest	$	50,443	$	47,403	$	45,055
Income taxes	$	39,776	$	26,908	$	35,299