Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from continuing operating activities
Net loss	$ (63,417)	$ (72,226)	$ (29,217)
Adjustments to reconcile net loss to net cash provided by continuing operating activities:
Income from discontinued operations, net of taxes			(1,076)
Deferred income taxes	(20,895)	1,825	(40,445)
Charge on extinguishment of debt		5,951
Depreciation, depletion and amortization of property, plant and equipment	68,325	70,266	66,996
Amortization of intangible and other assets	1,249	2,361	2,147
Loss associated with assets held for sale	9,701
Loss (gain) on sales of businesses and other property and equipment	678	(1,637)	6,977
Stock-based compensation	2,220	8,358	5,213
Other	2,794	2,098	434
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):
Accounts receivable	8,800	(2,167)	(6,321)
Inventories	6,092	(6,698)	56
Other supplies, prepaid items and other	(934)	564	(2,139)
Accounts payable	(7,987)	14,208	1,374
Accrued interest	586	(6,919)	(1)
Other current and noncurrent liabilities	(5,113)	1,638	(1,722)
Net cash provided by continuing operating activities	2,099	17,622	2,276
Cash flows from continuing investing activities
Expenditures for property, plant and equipment	(36,081)	(37,050)	(35,425)
Proceeds from sales of businesses and other property and equipment	61	6,660	23,841
Proceeds from property insurance recovery associated with property, plant and equipment		1,531
Net proceeds from sale of discontinued operations		2,730
Other investing activities	95	389	739
Net cash used by continuing investing activities	(35,925)	(25,740)	(10,845)
Cash flows from continuing financing activities
Proceeds from revolving debt facility	5,000	10,000
Payments on revolving debt facility	(15,000)
Net proceeds from 9.625% senior secured notes	35,086	390,473
Payments on senior secured notes		(375,000)
Proceeds from other long-term debt	20,219
Payments on other long-term debt	(14,073)	(9,170)	(14,121)
Payments of debt-related costs, including extinguishment and modification costs	(1,065)	(10,974)	(90)
Proceeds from short-term financing	12,179	10,865	10,919
Payments on short-term financing	(10,828)	(10,872)	(11,479)
Payments of preferred stock modification costs		(2,777)
Proceeds from exercises of stock options		20
Taxes paid on equity awards	(949)	(2,018)	(1,361)
Net cash provided (used) by continuing financing activities	30,569	547	(16,132)
Cash flows of discontinued operations:
Net cash used by operating activities	0	0	(1,461)
Net cash used by financing activities	0	0	(236)
Net cash used by discontinued operations	0	0	(1,697)
Net decrease in cash and cash equivalents	(3,257)	(7,571)	(26,398)
Cash and cash equivalents at beginning of year	26,048	33,619	60,017
Cash and cash equivalents at end of year	$ 22,791	$ 26,048	$ 33,619