Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Withholding taxes paid for conversion of employee stock awards	$ 1,350	$ 1,197
OPERATING ACTIVITIES:
Net earnings from continuing operations	49,796	42,290
Net earnings from discontinued operations	0	0
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	88,245	79,719
Pension and post-retirement	324	1,811
Deferred income taxes	15,289	12,575
Amortization of stock-based compensation	1,654	1,750
Proceeds from Contributions from Affiliates	1,403	1,183
Net (gain) loss on financial instruments	(2,800)	(2,500)
Changes in assets and liabilities:
Accounts receivable	(11,265)	(1,604)
Inventory and prepaid supplies	(1,163)	751
Accounts payable	(5,037)	18,314
Unearned revenue	(1)	(3,687)
Accrued expenses, salaries, wages, benefits and other liabilities	(3,782)	(11,696)
Pension and post-retirement balances	(6,582)	(7,412)
Other	(517)	(75)
NET CASH PROVIDED BY OPERATING ACTIVITIES	125,668	124,447
INVESTING ACTIVITIES:
Expenditures for property and equipment	(108,252)	(125,441)
Proceeds from property and equipment	76	44
Investment in nonconsolidated affiliate	0	(1,697)
NET CASH (USED IN) INVESTING ACTIVITIES	(108,176)	(127,094)
FINANCING ACTIVITIES:
Principal payments on long term obligations	(90,100)	(124,065)
Proceeds from revolving credit facilities	40,000	140,000
Payments for financing costs	0	(151)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(51,450)	14,587
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(33,958)	11,940
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	69,496	39,719
CASH AND CASH EQUIVALENTS AT END OF YEAR	35,538	51,659
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of amount capitalized	18,528	16,582
Federal and state income taxes paid	0	123
SUPPLEMENTAL NON-CASH INFORMATION:
Accrued expenditures for property and equipment	61,460	24,253
Net (gain) loss on financial instruments	$ 2,696	$ 9,472