Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Write off of Deferred Debt Issuance Cost	$ 6,505	$ 0
Withholding taxes paid for conversion of employee stock awards	1,236	1,839
OPERATING ACTIVITIES:
Net earnings from continuing operations	122,159	28,571
Net earnings from discontinued operations	65	4,008
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	163,590	153,088
Pension and post-retirement	3,622	1,944
Deferred income taxes	36,613	6,597
Amortization of stock-based compensation	3,479	3,951
Proceeds from Contributions from Affiliates	218	9,277
Net (gain) loss on financial instruments	(4,800)	10,200
Changes in assets and liabilities:
Accounts receivable	(22,688)	(3,677)
Inventory and prepaid supplies	5,107	(6,992)
Accounts payable	26,698	9,628
Unearned revenue	14,656	26,631
Accrued expenses, salaries, wages, benefits and other liabilities	6,306	(12,104)
Pension and post-retirement balances	(14,057)	(10,049)
Other	93	(3,631)
NET CASH PROVIDED BY OPERATING ACTIVITIES	307,191	248,996
INVESTING ACTIVITIES:
Expenditures for property and equipment	(300,249)	(265,882)
Proceeds from property and equipment	724	9,080
Investment in nonconsolidated affiliate	(2,482)	(5,556)
NET CASH USED IN INVESTING ACTIVITIES	(302,007)	(262,358)
FINANCING ACTIVITIES:
Principal payments on long term obligations	(1,725,919)	(543,240)
Proceeds from revolving credit facilities	1,430,600	80,000
Payments for financing costs	(2,806)	(7,507)
Proceeds from Issuance of Unsecured Debt	207,400	500,000
NET CASH PROVIDED BY FINANCING ACTIVITIES	40,006	27,414
Proceeds from issuance of warrants	131,967	0
NET INCREASE IN CASH AND CASH EQUIVALENTS	45,190	14,052
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	39,719	46,201
CASH AND CASH EQUIVALENTS AT END OF PERIOD	84,909	60,253
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of amount capitalized	20,112	16,779
Federal and state income taxes paid	1,227	650
SUPPLEMENTAL NON-CASH INFORMATION:
Accrued expenditures for property and equipment	40,143	44,171
Net (gain) loss on financial instruments	45,175	(2,679)
Asset Impairment Charges	$ 0	$ 39,075