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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities    
Net income (loss) $ 10,391 $ (19,817)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Deferred income taxes 256 (1,661)
Gain on extinguishment of debt (10,000)  
Depreciation and amortization of property, plant and equipment 33,725 34,572
Amortization of intangible and other assets 629 631
Other 1,749 3,192
Cash provided (used) by changes in assets and liabilities:    
Accounts receivable (23,369) (3,117)
Inventories 5,535 8,655
Prepaid insurance 6,633 6,642
Precious metals (1,014) (2,114)
Accounts payable 3,627 (7,674)
Accrued interest (20) 1,685
Other assets and other liabilities 2,439 (1,618)
Net cash provided by operating activities 30,581 19,376
Cash flows from investing activities    
Expenditures for property, plant and equipment (14,849) (17,953)
Other investing activities 300 299
Net cash used by investing activities (14,549) (17,654)
Cash flows from financing activities    
Proceeds from revolving debt facility 12,000 30,000
Payments on revolving debt facility (12,000)  
Proceeds from other long-term debt   12,570
Payments on other long-term debt (5,520) (4,411)
Payments on short-term financing (9,060) (6,095)
Other financing activities (91) (64)
Net cash provided (used) by financing activities (14,671) 32,000
Net increase in cash and cash equivalents 1,361 33,722
Cash and cash equivalents at beginning of period 16,264 22,791
Cash and cash equivalents at end of period $ 17,625 $ 56,513