CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net income	$ 13,545	$ 34,387
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	28,178	26,666
Deferred income taxes	2,727	412
(Income) loss from discontinued operations	(649)	307
Restructuring charges	824	562
Impairment recoveries	(35)	(4,631)
Gains on dispositions of property and other assets	(113)	(45)
Share-based compensation expense	2,762	4,747
Other non-cash items, net	2,681	2,373
Change in operating assets and liabilities (excluding the impact of acquisitions):
Receivables	(37,594)	(38,869)
Inventories	(3,043)	(3,210)
Current contract costs	(8,637)	(1,601)
Accounts payable	20,140	30,156
Restructuring liabilities	(904)	(1,496)
Accrued compensation	(5,753)	(3,834)
Contract liabilities	20,266	6,346
Income taxes payable	(8,904)	(81)
Other assets and liabilities, net	5,969	7,010
Net cash provided by operating activities	31,460	59,199
Cash flows from investing activities
Capital expenditures	(48,057)	(27,448)
Proceeds from insurance		6,886
Cash paid for acquired businesses, net		(1,661)
Proceeds from dispositions of property and other assets	1,292	662
Net cash used in investing activities	(46,765)	(21,561)
Cash flows from financing activities
Proceeds from borrowings	80,051	52,574
Payments on debt and capital lease obligations	(51,607)	(63,065)
Dividends paid on common stock	(4,095)	(4,077)
Debt issuance costs		(5)
Common stock purchased for treasury	(10,085)	(1,204)
Proceeds from exercise of stock options	84
Net cash provided by (used in) financing activities	14,348	(15,777)
Effect of exchange rate changes on cash and cash equivalents	(3,380)	1,281
Net change in cash and cash equivalents	(4,337)	23,142
Cash and cash equivalents, beginning of year	53,723	20,900
Cash and cash equivalents, end of period	$ 49,386	$ 44,042