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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from continuing operating activities      
Net income (loss) $ (72,226) $ (29,217) $ 112,168
Adjustments to reconcile net income (loss) to net cash provided (used) by continuing operating activities:      
Income from discontinued operations, net of taxes   (1,076) (200,301)
Deferred income taxes 1,825 (40,445) (42,013)
Loss on extinguishment of debt 5,951   8,703
Depreciation, depletion and amortization of property, plant and equipment 70,266 66,996 59,354
Amortization of intangible and other assets 2,361 2,147 1,940
Loss (gain) on sales of businesses and other property and equipment (1,637) 6,977 356
Stock-based compensation 8,358 5,213 3,992
Impairment of goodwill     1,621
Other 2,098 434 4,471
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):      
Accounts receivable (2,167) (6,321) (6)
Inventories (6,698) 56 1,372
Prepaid insurance (389) 635 (2,296)
Prepaid and accrued income taxes 1,074 (543) 5,619
Other supplies, prepaid items and other (121) (2,231) 167
Accounts payable 14,208 1,374 16,632
Accrued interest (6,919) (1) (2,305)
Other current and noncurrent liabilities 1,638 (1,722) 8,488
Net cash provided (used) by continuing operating activities 17,622 2,276 (22,038)
Cash flows from continuing investing activities      
Expenditures for property, plant and equipment (37,050) (35,425) (212,543)
Proceeds from sales of businesses and other property and equipment 6,660 23,841 5,259
Net proceeds from sale of discontinued operations 2,730   356,704
Proceeds from property insurance recovery associated with property, plant and equipment 1,531    
Other investing activities 389 739 3,877
Net cash provided (used) by continuing investing activities (25,740) (10,845) 153,297
Cash flows from continuing financing activities      
Proceeds from revolving debt facility 10,000   76,516
Payments on revolving debt facility     (76,516)
Proceeds from 9.625% senior secured notes, net of discount and fees 390,473    
Payments on senior secured notes (375,000)   (100,000)
Proceeds from other long-term debt, net of fees     14,751
Payments on other long-term debt (9,170) (14,121) (15,402)
Payments of debt-related costs, including extinguishment and modification costs (10,974) (90) (12,270)
Proceeds from short-term financing 10,865 10,919 11,161
Payments on short-term financing (10,872) (11,479) (11,392)
Payments of preferred stock modification costs (2,777)   (785)
Redemption of preferred stock     (71,966)
Proceeds from exercises of stock options 20   371
Taxes paid on equity awards (2,018) (1,361) (149)
Dividends paid on preferred stock     (8,028)
Net cash provided (used) by continuing financing activities 547 (16,132) (193,709)
Cash flows of discontinued operations:      
Net cash used by operating activities 0 (1,461) (1,363)
Net cash used by investing activities 0 0 (1,025)
Net cash used by financing activities 0 (236) (2,340)
Net cash used by discontinued operations 0 (1,697) (4,728)
Net decrease in cash and cash equivalents (7,571) (26,398) (67,178)
Cash and cash equivalents at beginning of year 33,619 60,017 127,195
Cash and cash equivalents at end of year $ 26,048 $ 33,619 $ 60,017