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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities    
Net income (loss) $ 54,580 $ (20,732)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Deferred income tax expense 9,046 10,724
Depreciation, amortization, depletion and accretion 6,155 5,807
Gain on extinguishment of debt (3,345) 0
Impairment of long-lived assets 0 26,103
Operating lease expense 1,481 3,130
Amortization of debt discount and debt issuance costs 945 1,064
Gain on change in estimate, asset retirement obligation (1,942) 0
Stock-based compensation expense 1,476 2,070
Earnings from equity method investments (61,944) (25,959)
Other non-cash items, net (352) 45
Changes in operating assets and liabilities:    
Receivables and related party receivables (2,835) (1,331)
Prepaid expenses and other assets (16) (9,056)
Inventories, net 3,658 4,688
Other long-term assets, net 2,383 (1,908)
Accounts payable 1,147 (1,123)
Accrued payroll and related liabilities 1,241 1,089
Other current liabilities (3,489) (220)
Operating lease liabilities (2,514) (1,678)
Other long-term liabilities (3,031) (23)
Distributions from equity method investees, return on investment 22,044 42,228
Net cash provided by operating activities 24,688 34,918
Cash flows from investing activities    
Distributions from equity method investees in excess of cumulative earnings 44,707 0
Acquisition of property, plant, equipment, and intangible assets, net (5,403) (4,879)
Mine development costs (1,262) (723)
Proceeds from sale of property and equipment 895 0
Net cash provided by (used in) investing activities 38,937 (5,602)
Cash flows from financing activities    
Principal payments on term loan (16,000) (18,000)
Principal payments on finance lease obligations (1,085) (1,026)
Dividends paid (92) (4,956)
Repurchase of common shares 0 (159)
Repurchase of common shares to satisfy tax withholdings (241) (531)
Borrowings from Paycheck Protection Program Loan 0 3,305
Net cash used in financing activities (17,418) (21,367)
Increase in Cash and Cash Equivalents and Restricted Cash 46,207 7,949
Cash and Cash Equivalents and Restricted Cash, beginning of period 35,932 17,080
Cash and Cash Equivalents and Restricted Cash, end of period 82,139 25,029
Supplemental disclosure of non-cash investing and financing activities:    
Acquisition of property, plant and equipment through accounts payable 128 446
Dividends payable $ 0 $ 47