Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Purchase of common stock	$ (11,184)	$ (62,155)
Withholding taxes paid for conversion of employee stock awards	(1,436)	(1,231)
OPERATING ACTIVITIES:
Net earnings (loss) from continuing operations	(72,351)	21,815
Net earnings (loss) from discontinued operations	4,271	(141)
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	121,589	101,971
Pension and post-retirement	18,916	10,146
Deferred income taxes	15,986	12,057
Amortization of stock-based compensation	2,648	2,248
Net loss on financial instruments	276
Changes in assets and liabilities:
Accounts receivable	11,770	2,750
Inventory and prepaid supplies	(2,661)	(4,203)
Accounts payable	11,698	726
Unearned revenue	6,995	(2,883)
Accrued expenses, salaries, wages, benefits and other liabilities	(7,357)	4,267
Pension and post-retirement assets	(10,658)	(10,551)
Other	(1,244)	1,670
NET CASH PROVIDED BY OPERATING ACTIVITIES	191,273	143,597
INVESTING ACTIVITIES:
Capital expenditures	(218,759)	(182,106)
Proceeds from property and equipment	9	7
Investment in nonconsolidated affiliate	(6,900)	0
NET CASH (USED IN) INVESTING ACTIVITIES	(215,675)	(182,099)
FINANCING ACTIVITIES:
Principal payments on long term obligations	(250,131)	(23,623)
Proceeds from borrowings	90,000	155,000
NET CASH PROVIDED BY FINANCING ACTIVITIES	61,935	67,991
Proceeds from convertible notes	258,750	0
Payments for financing costs	(6,469)	0
Purchase convertible note hedge	(56,097)	0
Proceeds from issuance of warrants	38,502	0
NET INCREASE IN CASH AND CASH EQUIVALENTS	37,533	29,489
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	16,358	17,697
CASH AND CASH EQUIVALENTS AT END OF PERIOD	53,891	47,186
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of amount capitalized	11,229	7,793
Federal alternative minimum and state income taxes paid	1,285	761
SUPPLEMENTAL NON-CASH INFORMATION:
Accrued capital expenditures	12,561	19,721
Net (gain) loss on financial instruments	(100,213)	(3,443)
Redemption of long term deposits	$ 9,975	$ 0