Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Purchase of common stock	$ 0	$ (3,581)
Withholding taxes paid for conversion of employee stock awards	1,521	1,329
OPERATING ACTIVITIES:
Net earnings from continuing operations	101,087	73,079
Net earnings from discontinued operations	305	536
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	210,641	143,471
Pension and post-retirement	11,775	2,826
Deferred income taxes	14,036	15,972
Amortization of stock-based compensation	5,281	3,568
Net (gain) loss on financial instruments	12,100	(3,700)
Changes in assets and liabilities:
Accounts receivable	13,842	18,159
Inventory and prepaid supplies	14	477
Accounts payable	(2,410)	1,097
Unearned revenue	2,830	(1,412)
Accrued expenses, salaries, wages, benefits and other liabilities	5,129	(4,618)
Pension and post-retirement assets	(10,419)	(32,000)
Other	3,135	765
NET CASH PROVIDED BY OPERATING ACTIVITIES	307,138	200,813
Loss from non-consolidated affiliates	12,458	7,600
INVESTING ACTIVITIES:
Expenditures for property and equipment	(336,944)	(214,025)
Proceeds from property and equipment	11,087	17,473
Investment in nonconsolidated affiliate	(21,762)	(8,285)
NET CASH (USED IN) INVESTING ACTIVITIES	(347,619)	(204,837)
FINANCING ACTIVITIES:
Principal payments on long term obligations	(38,906)	(39,889)
Other financing payments	(500)	0
Proceeds from borrowings	70,000	60,000
Payments for financing costs	(1,081)	414
NET CASH PROVIDED BY FINANCING ACTIVITIES	27,992	14,787
INCREASE (DECREASE)	(12,489)	10,763
BEGINNING OF YEAR	59,322	32,699
END OF PERIOD	46,833	43,462
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of amount capitalized	45,399	9,087
Income taxes paid	533	1,212
SUPPLEMENTAL NON-CASH INFORMATION:
Accrued expenditures for property and equipment	35,528	23,775
Net (gain) loss on financial instruments	$ 60,566	$ 28,707