CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net income	$ 52,093	$ 80,128
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	44,364	42,499
Deferred income taxes	3,182	318
(Income) loss from discontinued operations	(403)	408
Restructuring charges	999	817
Impairment recoveries	(35)	(29,098)
(Gains) losses on dispositions of property and other assets	(135)	465
Share-based compensation expense	5,056	9,484
Other non-cash items, net	3,553	3,603
Change in operating assets and liabilities (excluding the impact of acquisitions):
Receivables	(21,289)	(25,966)
Inventories	(2,792)	(726)
Current contract costs	(11,928)	(6,122)
Accounts payable	12,972	18,998
Restructuring liabilities	(1,330)	(1,748)
Accrued compensation	(12,275)	(7,455)
Contract liabilities	28,045	9,742
Income taxes payable	(9,580)	16,058
Other assets and liabilities, net	11,113	3,238
Net cash provided by operating activities	101,610	114,643
Cash flows from investing activities
Capital expenditures	(69,596)	(39,493)
Proceeds from insurance		31,570
Cash paid for acquired businesses, net		(1,661)
Proceeds from dispositions of property and other assets	1,320	734
Net cash used in investing activities	(68,276)	(8,850)
Cash flows from financing activities
Proceeds from borrowings	101,336	60,574
Payments on debt and capital lease obligations	(113,429)	(128,808)
Dividends paid on common stock	(6,128)	(6,119)
Debt issuance costs		(5)
Common stock purchased for treasury	(10,240)	(1,272)
Proceeds from exercise of stock options	84
Net cash used in financing activities	(28,377)	(75,630)
Effect of exchange rate changes on cash and cash equivalents	(3,210)	2,418
Net change in cash and cash equivalents	1,747	32,581
Cash and cash equivalents, beginning of year	53,723	20,900
Cash and cash equivalents, end of period	$ 55,470	$ 53,481