CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net income (loss)	$ (4,318)	$ 13,545
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	27,715	28,178
Deferred income taxes	6,215	2,727
Income from discontinued operations	(173)	(649)
Restructuring charges	5,143	824
Legal settlement	8,500
Impairment recoveries		(35)
Gains on dispositions of property and other assets	(731)	(113)
Share-based compensation expense	4,617	2,762
Multi-employer pension plan withdrawal	15,508
Other non-cash items, net	2,227	2,681
Change in operating assets and liabilities (excluding the impact of acquisitions):
Receivables	(51,293)	(37,594)
Inventories	(4,518)	(3,043)
Current contract costs	(2,000)	(8,637)
Accounts payable	31,303	20,140
Accrued compensation	3,647	(5,753)
Contract liabilities	17,259	20,266
Payments on operating lease obligations	(13,603)
Other assets and liabilities, net	(5,961)	(3,839)
Net cash provided by operating activities	39,537	31,460
Cash flows from investing activities
Capital expenditures	(46,517)	(43,429)
Cash paid for acquired businesses, net	(72,918)	(4,628)
Proceeds from dispositions of property and other assets	768	1,292
Net cash used in investing activities	(118,667)	(46,765)
Cash flows from financing activities
Proceeds from borrowings	133,827	80,051
Payments on debt and finance lease obligations	(47,862)	(51,607)
Dividends paid on common stock	(4,034)	(4,095)
Payment of payroll taxes on stock-based compensation through shares withheld or repurchased	(2,994)	(1,024)
Common stock purchased for treasury		(9,061)
Proceeds from exercise of stock options	92	84
Net cash provided by financing activities	79,029	14,348
Effect of exchange rate changes on cash and cash equivalents	786	(3,380)
Net change in cash and cash equivalents	685	(4,337)
Cash and cash equivalents, beginning of year	44,893	53,723
Cash and cash equivalents, end of period	$ 45,578	$ 49,386