CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities
Net loss	$ (68,283)	$ (325,280)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	39,986	43,051
Deferred income taxes	(131)	20,428
(Income) loss from discontinued operations	(534)	1,822
Restructuring charges	5,799	12,370
Impairment charges		203,076
Gains on dispositions of property and other assets	(9,345)	(14,935)
Share-based compensation expense	5,960	649
Multi-employer pension plan withdrawal	57	462
Other non-cash items, net	4,642	10,371
Change in operating assets and liabilities:
Receivables	(53,998)	104,722
Inventories	(68)	833
Current contract costs	(10,123)	16,418
Accounts payable	39,204	(76,355)
Restructuring liabilities	(4,413)	(4,606)
Accrued compensation	7,611	(25,268)
Contract liabilities	26,386	(32,650)
Income taxes payable	(181)	1,290
Other assets and liabilities, net	14,718	20,083
Net cash used in operating activities	(2,713)	(43,519)
Cash flows from investing activities
Capital expenditures	(45,187)	(40,057)
Cash surrender value of life insurance policies		24,767
Cash paid for acquisitions, net	(7,704)
Proceeds from dispositions of property and other assets	14,292	21,788
Net cash (used in) provided by investing activities	(38,599)	6,498
Cash flows from financing activities
Proceeds from borrowings	451,350	191,733
Payments on debt and finance lease obligations	(335,665)	(273,663)
Dividends paid on common stock		(4,064)
Dividends paid on preferred stock	(1,950)
Distributions to noncontrolling interest, net of contributions from noncontrolling interest	(798)	(1,526)
Payments of debt issuance costs	(1,767)	(1,585)
Payment of payroll taxes on stock-based compensation through shares withheld or repurchased	(1,119)	(1,062)
Common stock purchased for treasury		(2,785)
Proceeds from issuance of Convertible Series A Preferred Stock, net of issuance costs		125,763
Proceeds from exercise of stock options		2,077
Net cash provided by financing activities	110,051	34,888
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	2,551	(1,027)
Net change in cash, cash equivalents, and restricted cash	71,290	(3,160)
Cash, cash equivalents, and restricted cash, beginning of year	41,971	62,004
Cash, cash equivalents, and restricted cash, end of period	$ 113,261	$ 58,844