Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Write off of Deferred Debt Issuance Cost	$ 6,505	$ 0
Withholding taxes paid for conversion of employee stock awards	1,242	1,839
OPERATING ACTIVITIES:
Net earnings from continuing operations	184,522	22,826
Net earnings from discontinued operations	2,374	4,162
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	249,574	229,280
Pension and post-retirement	5,433	2,916
Deferred income taxes	55,023	17,728
Amortization of stock-based compensation	5,524	5,786
Proceeds from Contributions from Affiliates	1,364	11,762
Net (gain) loss on financial instruments	(7,000)	7,700
Changes in assets and liabilities:
Accounts receivable	(38,235)	13,066
Inventory and prepaid supplies	4,561	(8,927)
Accounts payable	18,261	13,466
Unearned revenue	(11,545)	49,605
Accrued expenses, salaries, wages, benefits and other liabilities	7,181	(8,623)
Pension and post-retirement balances	(20,743)	(20,920)
Other	(2,764)	(3,990)
NET CASH PROVIDED BY OPERATING ACTIVITIES	429,238	423,284
INVESTING ACTIVITIES:
Expenditures for property and equipment	(428,126)	(394,295)
Proceeds from property and equipment	3,524	9,210
Investment in nonconsolidated affiliate	(2,155)	(9,053)
NET CASH USED IN INVESTING ACTIVITIES	(426,757)	(394,138)
FINANCING ACTIVITIES:
Principal payments on long term obligations	(1,758,018)	(584,923)
Proceeds from revolving credit facilities	1,430,600	80,000
Payments for financing costs	(3,099)	(7,507)
Proceeds from Issuance of Unsecured Debt	207,400	500,000
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	7,608	(14,269)
Proceeds from issuance of warrants	131,967	0
NET INCREASE IN CASH AND CASH EQUIVALENTS	10,089	14,877
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	39,719	46,201
CASH AND CASH EQUIVALENTS AT END OF PERIOD	49,808	61,078
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of amount capitalized	39,104	36,060
Federal and state income taxes paid	1,859	758
SUPPLEMENTAL NON-CASH INFORMATION:
Accrued expenditures for property and equipment	27,358	25,832
Net (gain) loss on financial instruments	37,797	(56,072)
Asset Impairment Charges	$ 0	$ 39,075