Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Purchase of common stock	$ 0	$ (564)
Withholding taxes paid for conversion of employee stock awards	1,384	1,319
OPERATING ACTIVITIES:
Net earnings from continuing operations	22,634	15,682
Net earnings from discontinued operations	31	196
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	69,579	46,320
Pension and post-retirement	3,925	942
Deferred income taxes	4,705	5,053
Amortization of stock-based compensation	1,474	1,014
Changes in assets and liabilities:
Accounts receivable	15,754	10,567
Inventory and prepaid supplies	(4,441)	4,871
Accounts payable	2,206	(608)
Unearned revenue	3,080	(3,752)
Accrued expenses, salaries, wages, benefits and other liabilities	(9,267)	(10,079)
Pension and post-retirement assets	(2,252)	(4,584)
Other	4,474	2,335
NET CASH PROVIDED BY OPERATING ACTIVITIES	107,402	68,842
INVESTING ACTIVITIES:
Expenditures for property and equipment	(91,856)	(79,092)
Proceeds from property and equipment	0	16,763
Investment in nonconsolidated affiliate	(15,844)	(2,450)
NET CASH (USED IN) INVESTING ACTIVITIES	(107,700)	(64,779)
FINANCING ACTIVITIES:
Principal payments on long term obligations	(7,969)	(17,390)
Other financing payments	(264)	(17)
Proceeds from borrowings	0	30,000
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(9,617)	10,710
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(9,915)	14,773
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	59,322	32,699
CASH AND CASH EQUIVALENTS AT END OF PERIOD	49,407	47,472
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of amount capitalized	16,925	2,413
Income taxes paid	0	526
SUPPLEMENTAL NON-CASH INFORMATION:
Accrued expenditures for property and equipment	15,812	24,629
Net (gain) loss on financial instruments	$ 4,500	$ (885)