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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities      
Net income (loss) $ 43,545 $ (61,911) $ (63,417)
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:      
Deferred income taxes (4,306) (4,778) (20,895)
Depreciation and amortization of property, plant and equipment 68,689 69,581 68,325
Amortization of intangible and other assets 1,254 1,260 1,249
Loss associated with assets held for sale     9,701
Net loss on extinguishments of debt 10,259    
Amortization of debt issuance costs, including discounts and premiums 6,067 3,807 3,620
Stock-based compensation 5,516 1,761 2,220
Loss (gain) associated with commodity contracts (2,706) 1,613  
Other 2,653 910 (148)
Cash provided (used) by changes in assets and liabilities:      
Accounts receivable (42,913) (4,702) 8,800
Inventories 3,261 3,550 6,092
Supplies, prepaid items and other (8,642) (6,585) (933)
Accounts payable 932 (6,561) (7,987)
Other assets and other liabilities 4,018 (458) (4,528)
Net cash provided (used) by operating activities 87,627 (2,513) 2,099
Cash flows from investing activities      
Expenditures for property, plant and equipment (35,128) (30,471) (36,081)
Proceeds from vendor settlements associated with property, plant and equipment   1,647  
Other investing activities 434 398 156
Net cash used by investing activities (34,694) (28,426) (35,925)
Cash flows from financing activities      
Proceeds from revolving debt facility 12,000 30,000 5,000
Payments on revolving debt facility (12,000) (30,000) (15,000)
Payments on 9.625% senior secured notes (435,000)    
Proceeds from other long-term debt   42,570 20,219
Payments on other long-term debt (10,472) (21,356) (14,073)
Payments of debt-related costs, including extinguishment costs (27,254) (124) (1,065)
Proceeds from short-term financing 16,689 14,589 12,179
Payments on short-term financing (17,549) (10,941) (10,828)
Payments of costs to exchange redeemable preferred stocks for common stock (7,363)    
Taxes paid on equity awards (4,228) (326) (949)
Payments of dividends on non-redeemable preferred stocks (1,876)    
Net cash provided by financing activities 12,947 24,412 30,569
Net increase (decrease) in cash and cash equivalents 65,880 (6,527) (3,257)
Cash and cash equivalents at beginning of year 16,264 22,791 26,048
Cash and cash equivalents at end of year 82,144 $ 16,264 22,791
6.25% Senior Secured Notes due 2028 [Member]      
Cash flows from financing activities      
Net proceeds from senior secured notes $ 500,000    
9.625% Senior Secured Notes due 2023 [Member]      
Cash flows from financing activities      
Net proceeds from senior secured notes     $ 35,086