CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net income (loss)	$ 24,795	$ (92,735)	$ (376,952)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	52,483	53,750	56,565
Deferred income taxes	1,820	6,012	15,097
(Income) loss from discontinued operations	(148)	(558)	1,847
Restructuring charges	3,059	6,066	13,440
Impairment charges	583	0	203,076
Gains on dispositions of property and other assets	(272)	(9,374)	(14,935)
Gain on disposition of ON Services	(19,637)	0	0
Share-based compensation expense	10,241	7,727	2,653
Multi-employer pension plan withdrawal	0	57	462
Other non-cash items, net	12,843	5,318	8,056
Change in operating assets and liabilities (excluding the impact of acquisitions):
Receivables	(39,402)	(75,450)	106,082
Inventories	(2,587)	129	8,644
Current contract costs	(4,651)	(3,284)	16,279
Accounts payable	7,756	46,694	(88,251)
Restructuring liabilities	(2,735)	(5,923)	(7,427)
Accrued compensation	11,321	4,221	(26,375)
Contract liabilities	5,607	20,881	(31,585)
Income taxes payable	7,147	1,003	770
Other assets and liabilities, net	5,208	(2,386)	32,306
Net cash provided by (used in) operating activities	73,431	(37,852)	(80,248)
Cash flows from investing activities
Capital expenditures	(67,170)	(57,936)	(53,567)
Cash surrender value of life insurance policies	0	0	24,767
Cash paid for acquisitions, net	(25,494)	(8,227)	0
Proceeds from sale of ON Services	28,926	0	0
Proceeds from dispositions of property and other assets	470	14,360	22,027
Net cash used in investing activities	(63,268)	(51,803)	(6,773)
Cash flows from financing activities
Proceeds from borrowings	107,580	461,322	225,422
Payments on debt and finance lease obligations	(103,491)	(345,297)	(275,327)
Dividends paid on common stock	0	0	(4,064)
Dividends paid on preferred stock	(7,801)	(3,900)	0
Distributions to noncontrolling interest, net of contributions from noncontrolling interest	(570)	(843)	(1,526)
Payments of debt issuance costs	(418)	(1,767)	(1,585)
Payment of payroll taxes on stock-based compensation through shares withheld or repurchased	(1,428)	(1,626)	(1,688)
Common stock purchased for treasury	0	0	(2,785)
Proceeds from issuance of Convertible Series A Preferred Stock, net of issuance costs	0	0	125,763
Proceeds from exercise of stock options	0	0	2,077
Net cash provided by (used in) financing activities	(6,128)	107,889	66,287
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(3,774)	4,098	701
Net change in cash, cash equivalents, and restricted cash	261	22,332	(20,033)
Cash, cash equivalents, and restricted cash, beginning of year	64,303	41,971	62,004
Cash, cash equivalents, and restricted cash, end of year	$ 64,564	$ 64,303	$ 41,971