CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net income (loss)	$ (9,835)	$ 6,513
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	13,063	12,144
Deferred income taxes	(4,507)	374
Loss (income) from discontinued operations	(928)	816
Restructuring charges	162	394
Impairment recoveries		(2,384)
Gains on dispositions of property and other assets	(73)	(50)
Share-based compensation expense	717	1,999
Other non-cash items, net	1,803	1,287
Change in operating assets and liabilities (excluding the impact of acquisitions):
Receivables	(13,255)	(26,219)
Inventories	70	(770)
Current contract costs	(9,211)	(3,739)
Accounts payable	5,354	29,437
Restructuring liabilities	(359)	(1,137)
Accrued compensation	(16,149)	(16,027)
Contract liabilities	20,888	13,505
Income taxes payable	(7,475)	(3,206)
Other assets and liabilities, net	16,316	19,301
Net cash provided by (used in) operating activities	(3,419)	32,238
Cash flows from investing activities
Capital expenditures	(26,586)	(14,662)
Proceeds from insurance		4,583
Cash paid for acquired businesses, net		(1,661)
Proceeds from dispositions of property and other assets	1,139	550
Net cash used in investing activities	(25,447)	(11,190)
Cash flows from financing activities
Proceeds from borrowings	36,038	17,574
Payments on debt and capital lease obligations	(15,348)	(30,985)
Dividends paid on common stock	(2,046)	(2,038)
Common stock purchased for treasury	(868)	(1,204)
Proceeds from exercise of stock options	84
Net cash provided by (used in) financing activities	17,860	(16,653)
Effect of exchange rate changes on cash and cash equivalents	(377)	139
Net change in cash and cash equivalents	(11,383)	4,534
Cash and cash equivalents, beginning of year	53,723	20,900
Cash and cash equivalents, end of period	$ 42,340	$ 25,434