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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities    
Net (loss) income $ (1,893) $ 14,402
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Deferred income tax expense (benefit) 788 (677)
Depreciation, amortization, depletion and accretion 2,297 2,102
Operating lease expense 774 775
Amortization of debt discount and debt issuance costs 354 381
Stock-based compensation expense 506 317
Earnings from equity method investments (8,273) (21,690)
Other non-cash items, net 0 75
Changes in operating assets and liabilities:    
Receivables and related party receivables 2,988 1,845
Prepaid expenses and other assets 226 80
Inventories, net 1,572 3,262
Other long-term assets, net (89) (2)
Accounts payable (1,477) (789)
Accrued payroll and related liabilities (973) (4,500)
Other current liabilities (23) 2,154
Operating lease liabilities (634) (804)
Other long-term liabilities (22) (401)
Distributions from equity method investees, return on investment 17,116 19,488
Net cash provided by operating activities 13,237 16,018
Cash flows from investing activities    
Acquisition of business 0 (661)
Acquisition of property, plant, equipment, and intangible assets, net (1,289) (1,087)
Mine development costs (447) (324)
Net cash used in investing activities (1,736) (2,072)
Cash flows from financing activities    
Principal payments on term loan (6,000) (6,000)
Principal payments on finance lease obligations (340) (344)
Dividends paid (4,518) (4,571)
Repurchase of common shares (159) (693)
Repurchase of common shares to satisfy tax withholdings (376) (245)
Net cash used in financing activities (11,393) (11,853)
Increase in Cash and Cash Equivalents and Restricted Cash 108 2,093
Cash and Cash Equivalents and Restricted Cash, beginning of period 17,080 23,772
Cash and Cash Equivalents and Restricted Cash, end of period 17,188 25,865
Supplemental disclosure of non-cash investing and financing activities:    
Acquisition of property, plant and equipment through accounts payable 1,890 0
Dividends payable $ 105 $ 58