CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
OPERATING ACTIVITIES:
Net earnings from continuing operations	$ 58,163	$ 104,006
Net earnings from discontinued operations	0	882
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	178,735	175,820
Pension and post-retirement	9,490	648
Deferred income taxes	14,919	29,840
Amortization of stock-based compensation	3,966	3,854
Loss from non-consolidated affiliates	2,513	4,623
Net (gain) loss on financial instruments	(78)	(8,707)
Changes in assets and liabilities:
Accounts receivable	82,597	(54,861)
Inventory and prepaid supplies	1,052	(5,639)
Accounts payable	55,834	13,211
Unearned revenue	18,323	(9,660)
Accrued expenses, salaries, wages, benefits and other liabilities	(15,166)	10,439
Pension and post-retirement balances	(4,363)	(12,698)
Other	2,591	(1,549)
NET CASH PROVIDED BY OPERATING ACTIVITIES	408,576	250,209
INVESTING ACTIVITIES:
Expenditures for property and equipment	(412,925)	(294,210)
Proceeds from property and equipment	10,445	154
Acquisitions and investments in businesses	(800)	(16,545)
NET CASH (USED IN) INVESTING ACTIVITIES	(403,280)	(310,601)
FINANCING ACTIVITIES:
Principal payments on long term obligations	(90,317)	(295,310)
Proceeds from revolving credit facilities	140,000	450,000
Payments for financing costs	(511)	0
Repurchase of senior unsecured notes	0	(115,204)
Purchase of common stock	(36,874)	0
Withholding taxes paid for conversion of employee stock awards	(1,578)	(1,439)
NET CASH PROVIDED BY FINANCING ACTIVITIES	10,720	38,047
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	16,016	(22,345)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	27,134	69,496
CASH AND CASH EQUIVALENTS AT END OF YEAR	43,150	47,151
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of amount capitalized	20,238	22,198
Federal and state income taxes paid	6,513	507
SUPPLEMENTAL NON-CASH INFORMATION:
Accrued expenditures for property and equipment	$ 77,412	$ 51,228