CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
OPERATING ACTIVITIES
Net loss	$ (160,423)	$ (739)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization and other non-cash charges	39,532	43,062
Stock-based compensation expense	2,097	2,452
Gain on disposition of assets, net	819	3,504
Deferred income tax benefit	(33,495)	(7,446)
Impairment and other non-cash charges	205,437
(Increase) decrease in assets:
Accounts receivable	(5,664)	4,400
Income taxes receivable	(10,855)	27,219
Inventories	3,286	5,731
Prepaid expenses	1,753	423
Other current assets	81	354
Other non-current assets	4,980	(2,844)
Increase (decrease) in liabilities:
Accounts payable	17,004	3,666
Income taxes payable	257	(1,187)
Accrued payroll and related expenses	182	433
Accrued insurance expenses	(448)	179
Accrued state, local and other taxes	1,347	1,647
Other accrued expenses	(2,733)	166
Pension liabilities	(5,070)	3,145
Long-term accrued insurance expenses	825	637
Other long-term liabilities	(2,435)	(648)
Net cash provided by operating activities	54,839	77,146
INVESTING ACTIVITIES
Capital expenditures	(25,019)	(62,280)
Proceeds from sale of assets	3,595	6,070
Net cash used for investing activities	(21,424)	(56,210)
FINANCING ACTIVITIES
Payment of dividends		(21,486)
Cash paid for common stock purchased and retired	(792)	(2,698)
Net cash used for financing activities	(792)	(24,184)
Net increase (decrease) in cash and cash equivalents	32,623	(3,248)
Cash and cash equivalents at beginning of year	50,023	116,262
Cash and cash equivalents at end of year	82,646	113,014
Income taxes (refund) paid, net	(12,281)	292
Capital expenditures included in accounts payable	$ 7,250	$ 17,634