Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
OPERATING ACTIVITIES:
Net earnings from continuing operations	$ 8,619	$ 20,141
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	94,965	90,936
Pension and post-retirement	2,571	4,745
Deferred income taxes	2,276	4,768
Amortization of stock-based compensation	2,600	1,405
Loss from non-consolidated affiliates	79	406
Net (gain) loss on financial instruments	(2,355)	1,740
Changes in assets and liabilities:
Accounts receivable	(5,704)	74,500
Inventory and prepaid supplies	924	(1,361)
Accounts payable	1,226	13,321
Unearned revenue	518	13,361
Accrued expenses, salaries, wages, benefits and other liabilities	23,311	(4,643)
Pension and post-retirement balances	(2,437)	(2,452)
Other	(173)	(489)
NET CASH PROVIDED BY OPERATING ACTIVITIES	126,420	216,378
INVESTING ACTIVITIES:
Expenditures for property and equipment	(102,321)	(218,801)
Proceeds from property and equipment	895	9,860
Acquisitions and investments in businesses	(9,800)	(800)
NET CASH (USED IN) INVESTING ACTIVITIES	(111,226)	(209,741)
FINANCING ACTIVITIES:
Principal payments on long term obligations	(140,105)	(25,214)
Proceeds from revolving credit facilities	95,000	105,000
Payments for financing costs	0	(484)
Purchase of common stock	0	(21,918)
Withholding taxes paid for conversion of employee stock awards	(463)	(1,553)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(45,568)	55,831
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(30,374)	62,468
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	53,555	27,134
CASH AND CASH EQUIVALENTS AT END OF YEAR	23,181	89,602
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of amount capitalized	31,622	11,652
Federal and state income taxes paid	28	60
Restricted balance of cash	11,459	1,997
SUPPLEMENTAL NON-CASH INFORMATION:
Accrued expenditures for property and equipment	$ 62,653	$ 68,338