Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Purchase of common stock	$ 0	$ (3,581)
Withholding taxes paid for conversion of employee stock awards	1,496	1,329
OPERATING ACTIVITIES:
Net earnings (loss) from continuing operations	(3,998)	40,146
Net earnings from discontinued operations	62	366
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	139,516	94,270
Pension and post-retirement	7,850	1,884
Deferred income taxes	8,021	10,475
Amortization of stock-based compensation	3,394	2,304
Net (gain) loss on financial instruments	10,700	(3,200)
Changes in assets and liabilities:
Accounts receivable	21,235	11,006
Inventory and prepaid supplies	(4,242)	3,433
Accounts payable	(3,899)	(2,067)
Unearned revenue	896	(1,504)
Accrued expenses, salaries, wages, benefits and other liabilities	1,874	(3,406)
Pension and post-retirement assets	(4,747)	(8,323)
Other	2,281	(742)
NET CASH PROVIDED BY OPERATING ACTIVITIES	209,443	141,983
Loss from non-consolidated affiliates	9,814	4,953
INVESTING ACTIVITIES:
Expenditures for property and equipment	(216,769)	(150,816)
Proceeds from property and equipment	78	17,452
Investment in nonconsolidated affiliate	(18,429)	(5,150)
NET CASH (USED IN) INVESTING ACTIVITIES	(235,120)	(138,514)
FINANCING ACTIVITIES:
Principal payments on long term obligations	(15,938)	(29,140)
Other financing payments	(346)	0
Proceeds from borrowings	40,000	30,000
Payments for financing costs	(1,081)	414
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	21,139	(4,464)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(4,538)	(995)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	59,322	32,699
CASH AND CASH EQUIVALENTS AT END OF PERIOD	54,784	31,704
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of amount capitalized	30,338	6,450
Income taxes paid	533	806
SUPPLEMENTAL NON-CASH INFORMATION:
Accrued expenditures for property and equipment	26,601	18,755
Net (gain) loss on financial instruments	$ (31,386)	$ 10,812

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Amount of cash inflow (outflow) from financing activities classified as other.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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No definition available.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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