CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
OPERATING ACTIVITIES:
Net earnings from continuing operations	$ 20,141	$ 49,796
Net earnings from discontinued operations	0	0
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	90,936	88,245
Pension and post-retirement	4,745	324
Deferred income taxes	4,768	15,289
Amortization of stock-based compensation	1,405	1,654
Loss from non-consolidated affiliates	406	1,403
Net (gain) loss on financial instruments	1,740	(2,696)
Changes in assets and liabilities:
Accounts receivable	74,500	(11,265)
Inventory and prepaid supplies	(1,361)	(1,163)
Accounts payable	13,321	(5,037)
Unearned revenue	13,361	(1)
Accrued expenses, salaries, wages, benefits and other liabilities	(4,643)	(3,782)
Pension and post-retirement balances	(2,452)	(6,582)
Other	(489)	(517)
NET CASH PROVIDED BY OPERATING ACTIVITIES	216,378	125,668
INVESTING ACTIVITIES:
Expenditures for property and equipment	(218,801)	(108,252)
Proceeds from property and equipment	9,860	76
Acquisitions and investments in businesses	(800)	0
NET CASH (USED IN) INVESTING ACTIVITIES	(209,741)	(108,176)
FINANCING ACTIVITIES:
Principal payments on long term obligations	(25,214)	(90,100)
Proceeds from revolving credit facilities	105,000	40,000
Payments for financing costs	(484)	0
Purchase of common stock	(21,918)	0
Withholding taxes paid for conversion of employee stock awards	(1,553)	(1,350)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	55,831	(51,450)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	62,468	(33,958)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	27,134	69,496
CASH AND CASH EQUIVALENTS AT END OF YEAR	89,602	35,538
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of amount capitalized	11,652	18,528
Federal and state income taxes paid	60	0
SUPPLEMENTAL NON-CASH INFORMATION:
Accrued expenditures for property and equipment	$ 68,338	$ 61,460