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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities    
Net loss $ (19,817) $ (4,909)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Deferred income taxes (1,661) (5,290)
Depreciation and amortization of property, plant and equipment 34,572 33,910
Amortization of intangible and other assets 631 625
Other 3,192 2,489
Cash provided (used) by changes in assets and liabilities:    
Accounts receivable (3,117) (1,806)
Inventories 8,655 9,901
Prepaid insurance 6,642 5,892
Precious metals (2,114) (1,515)
Accounts payable (7,674) (17,440)
Accrued interest 1,685 687
Other assets and other liabilities (1,618) (2,283)
Net cash provided by operating activities 19,376 20,261
Cash flows from investing activities    
Expenditures for property, plant and equipment (17,953) (12,866)
Other investing activities 299 62
Net cash used by investing activities (17,654) (12,804)
Cash flows from financing activities    
Proceeds from revolving debt facility 30,000 5,000
Payments on revolving debt facility   (15,000)
Net proceeds from 9.625% senior secured notes   35,086
Proceeds from other long-term debt 12,570 15,795
Payments on other long-term debt (4,411) (10,083)
Payments on short-term financing (6,095) (5,355)
Taxes paid on equity awards (64) (690)
Other financing activities   (287)
Net cash provided by financing activities 32,000 24,466
Net increase in cash and cash equivalents 33,722 31,923
Cash and cash equivalents at beginning of period 22,791 26,048
Cash and cash equivalents at end of period $ 56,513 $ 57,971