CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
OPERATING ACTIVITIES
Net income (loss)	$ 7,217,000	$ (212,192,000)	$ (87,111,000)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and other non-cash charges	72,506,000	95,309,000	172,607,000
Stock-based compensation expense	6,576,000	8,735,000	8,630,000
Gain on disposition of assets, net	(10,882,000)	(9,523,000)	(2,645,000)
Gain due to benefit plan financing arrangement		(891,000)	(126,000)
Deferred income tax provision (benefit)	4,888,000	(25,845,000)	(22,225,000)
Impairment and other non-cash charges		211,043,000	73,560,000
(Increase) decrease in assets:
Accounts receivable	(91,082,000)	80,769,000	81,094,000
Income taxes receivable	24,439,000	(58,798,000)	11,687,000
Inventories	3,951,000	18,076,000	20,962,000
Prepaid expenses	(650,000)	1,337,000	(692,000)
Other current assets	90,000	227,000	300,000
Other non-current assets	(1,170,000)	(3,819,000)	(3,024,000)
Increase (decrease) in liabilities:
Accounts payable	32,900,000	(9,130,000)	(42,241,000)
Income taxes payable	(459,000)	(419,000)	(3,172,000)
Accrued payroll and related expenses	(3,080,000)	(1,219,000)	(6,103,000)
Accrued insurance expenses	4,640,000	(2,051,000)	1,357,000
Accrued state, local and other taxes	(883,000)	361,000	(654,000)
Other accrued expenses	(4,061,000)	(6,541,000)	(2,089,000)
Pension liabilities	(1,065,000)	(3,249,000)	6,575,000
Long-term accrued insurance expenses	(52,000)	(2,218,000)	1,968,000
Other long-term liabilities	3,896,000	(2,004,000)	483,000
Net cash provided by operating activities	47,719,000	77,958,000	209,141,000
INVESTING ACTIVITIES
Capital expenditures	(67,645,000)	(65,065,000)	(250,629,000)
Proceeds from sale of assets	20,014,000	22,406,000	14,841,000
Proceeds from benefit plan financing arrangement		1,566,000	507,000
Re-investment in benefit plan financing arrangement		(1,566,000)	(507,000)
Net cash used for investing activities	(47,631,000)	(42,659,000)	(235,788,000)
FINANCING ACTIVITIES
Payment of dividends			(32,231,000)
Cash paid for common stock purchased and retired	(567,000)	(826,000)	(7,361,000)
Cash paid for finance lease	(1,584,000)
Net cash used for financing activities	(2,151,000)	(826,000)	(39,592,000)
Net (decrease) increase in cash and cash equivalents	(2,063,000)	34,473,000	(66,239,000)
Cash and cash equivalents at beginning of period	84,496,000	50,023,000	116,262,000
Cash and cash equivalents at end of period	82,433,000	84,496,000	50,023,000
Supplemental cash flows disclosure:
Income taxes refund, net	(20,903,000)	(10,051,000)	(11,817,000)
Interest paid	166,000	160,000	162,000
Supplemental disclosure of noncash investing activities:
Capital expenditures included in accounts payable	$ 4,282,000	$ 3,859,000	$ 6,795,000