Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Purchase of common stock	$ (3,581)	$ (11,184)
Withholding taxes paid for conversion of employee stock awards	1,329	1,436
OPERATING ACTIVITIES:
Net earnings (loss) from continuing operations	73,079	(72,351)
Net earnings (loss) from discontinued operations	536	(4,271)
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	143,471	121,589
Pension and post-retirement	2,826	18,916
Deferred income taxes	15,972	15,986
Amortization of stock-based compensation	3,568	2,648
Net (gain) loss on financial instruments	(3,714)	154
Changes in assets and liabilities:
Accounts receivable	18,159	11,770
Inventory and prepaid supplies	477	(2,661)
Accounts payable	1,097	11,698
Unearned revenue	(1,412)	6,995
Accrued expenses, salaries, wages, benefits and other liabilities	(4,618)	(7,357)
Pension and post-retirement assets	(32,000)	(10,658)
Other	8,365	(1,244)
NET CASH PROVIDED BY OPERATING ACTIVITIES	200,813	191,273
INVESTING ACTIVITIES:
Capital expenditures	(214,025)	(218,759)
Proceeds from property and equipment	17,473	9
Investment in nonconsolidated affiliate	(8,285)	(6,900)
Redemption of long term deposits	0	9,975
NET CASH (USED IN) INVESTING ACTIVITIES	(204,837)	(215,675)
FINANCING ACTIVITIES:
Principal payments on long term obligations	(39,889)	(250,131)
Proceeds from borrowings	60,000	90,000
Proceeds from convertible notes	0	258,750
Payments for financing costs	(414)	(6,469)
Purchase convertible note hedges	0	(56,097)
NET CASH PROVIDED BY FINANCING ACTIVITIES	14,787	61,935
Proceeds from issuance of warrants	0	38,502
NET INCREASE IN CASH AND CASH EQUIVALENTS	10,763	37,533
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	32,699	16,358
CASH AND CASH EQUIVALENTS AT END OF PERIOD	43,462	53,891
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of amount capitalized	9,087	11,229
Federal alternative minimum and state income taxes paid	1,212	1,285
SUPPLEMENTAL NON-CASH INFORMATION:
Accrued capital expenditures	23,775	12,561
Net (gain) loss on financial instruments	$ 28,707	$ (100,213)

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-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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- Definition

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.

+ References

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- References

No definition available.

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- Definition

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.

+ References

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