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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities    
Net loss $ (40,219) $ (35,703)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Deferred income taxes (3,054) (5,797)
Depreciation and amortization of property, plant and equipment 51,957 51,575
Amortization of intangible and other assets 946 936
Stock-based compensation 1,626 1,799
Other 3,630 2,951
Cash provided (used) by changes in assets and liabilities:    
Accounts receivable (1,860) 15,511
Inventories 3,661 8,852
Prepaid insurance 10,359 9,446
Accounts payable (11,269) (15,257)
Accrued interest 12,083 10,886
Other assets and other liabilities (3,145) (4,227)
Net cash provided by operating activities 24,715 40,972
Cash flows from investing activities    
Expenditures for property, plant and equipment (22,230) (20,455)
Proceeds from vendor settlements associated with property, plant and equipment 1,647  
Other investing activities 364 97
Net cash used by investing activities (20,219) (20,358)
Cash flows from financing activities    
Proceeds from revolving debt facility 30,000 5,000
Payments on revolving debt facility (30,000) (15,000)
Net proceeds from 9.625% senior secured notes   35,086
Proceeds from other long-term debt 42,570 16,830
Payments on other long-term debt (18,397) (12,065)
Payments of debt-related costs (124) (1,065)
Payments on short-term financing (9,178) (7,970)
Taxes paid on equity awards (64) (695)
Net cash provided by financing activities 14,807 20,121
Net increase in cash and cash equivalents 19,303 40,735
Cash and cash equivalents at beginning of period 22,791 26,048
Cash and cash equivalents at end of period $ 42,094 $ 66,783