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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenues:    
Total revenues $ 12,263 $ 19,329
Operating expenses:    
Payroll and benefits 2,742 2,556
Legal and professional fees 2,043 2,204
General and administrative 2,331 1,914
Depreciation, amortization, depletion and accretion 2,297 2,102
Total operating expenses 20,904 22,884
Operating loss (8,641) (3,555)
Other income (expense):    
Earnings from equity method investments 8,273 21,690
Interest expense (1,210) (2,104)
Other 43 70
Total other income 7,106 19,656
(Loss) income before income tax expense (1,535) 16,101
Income tax expense 358 1,699
Net (loss) income $ (1,893) $ 14,402
(Loss) earnings per common share (Note 1):    
Basic (in dollars per share) $ (0.11) $ 0.79
Diluted (in dollars per share) $ (0.11) $ 0.78
Weighted-average number of common shares outstanding:    
Basic (in shares) 17,932 18,268
Diluted (in shares) 17,932 18,433
Consumables    
Revenues:    
Total revenues $ 9,217 $ 15,109
Operating expenses:    
Consumables cost of revenue, exclusive of depreciation and amortization 11,491 14,108
License royalties, related party    
Revenues:    
Total revenues $ 3,046 $ 4,220