Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Write off of Deferred Debt Issuance Cost	$ 0	$ 6,505
Withholding taxes paid for conversion of employee stock awards	1,439	1,236
OPERATING ACTIVITIES:
Net earnings from continuing operations	104,006	122,159
Net earnings from discontinued operations	882	65
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	175,820	163,590
Pension and post-retirement	648	3,622
Deferred income taxes	29,840	36,613
Amortization of stock-based compensation	3,854	3,479
Proceeds from Contributions from Affiliates	4,623	218
Net (gain) loss on financial instruments	(4,100)	(4,800)
Changes in assets and liabilities:
Accounts receivable	(54,861)	(22,688)
Inventory and prepaid supplies	(5,639)	5,107
Accounts payable	13,211	26,698
Unearned revenue	(9,660)	14,656
Accrued expenses, salaries, wages, benefits and other liabilities	10,439	6,306
Pension and post-retirement balances	(12,698)	(14,057)
Other	(1,549)	93
NET CASH PROVIDED BY OPERATING ACTIVITIES	250,209	307,191
INVESTING ACTIVITIES:
Expenditures for property and equipment	(294,210)	(300,249)
Proceeds from property and equipment	154	724
Investment in nonconsolidated affiliate	(16,545)	(2,482)
NET CASH (USED IN) INVESTING ACTIVITIES	(310,601)	(302,007)
FINANCING ACTIVITIES:
Payment for Debt Extinguishment or Debt Prepayment Cost	(115,204)	0
Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security	295,310	1,725,919
Proceeds from revolving credit facilities	450,000	1,430,600
Payments for financing costs	0	(2,806)
Proceeds from Issuance of Unsecured Debt	0	207,400
NET CASH PROVIDED BY FINANCING ACTIVITIES	38,047	40,006
Proceeds from issuance of warrants	0	131,967
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(22,345)	45,190
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	69,496	39,719
CASH AND CASH EQUIVALENTS AT END OF YEAR	47,151	84,909
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of amount capitalized	22,198	20,112
Federal and state income taxes paid	507	1,227
SUPPLEMENTAL NON-CASH INFORMATION:
Accrued expenditures for property and equipment	51,228	40,143
Net (gain) loss on financial instruments	$ 8,707	$ 45,175