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CONDENSED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenues:        
Total revenues $ 227,440 $ 163,701 $ 441,204 $ 390,421
Costs and expenses:        
Cost of sales (exclusive of items shown separately below) 152,765 130,777 307,115 282,291
Cost of other revenues (exclusive of items shown separately below) 8,343 7,642 16,138 15,203
Depreciation and depletion 40,151 22,156 73,054 50,848
Selling, general and administrative 11,115 8,457 18,752 16,913
Business interruption 7,020 0 7,020 0
Idle mine 10,876 0 10,876 0
Total costs and expenses 230,270 169,032 432,955 365,255
Operating (loss) income (2,830) (5,331) 8,249 25,166
Interest expense, net (8,477) (8,255) (17,170) (15,788)
Other income (expense) 0 0 (109) 1,822
(Loss) income before income tax (benefit) expense (11,307) (13,586) (9,030) 11,200
Income tax (benefit) expense (6,626) (4,425) 17,006 (1,184)
Net (loss) income $ (4,681) $ (9,161) $ (26,036) $ 12,384
Basic and diluted net (loss) income per share:        
Net (loss) income per share-basic (in dollars per share) $ (0.09) $ (0.18) $ (0.51) $ 0.24
Net (loss) income per share-diluted (in dollars per share) $ (0.09) $ (0.18) $ (0.51) $ 0.24
Weighted average number of shares outstanding-basic (in shares) 51,449 51,187 51,362 51,147
Weighted average number of shares outstanding-diluted (in shares) 51,449 51,187 51,362 51,255
Dividends per share (in dollars per share) $ 0.05 $ 0.05 $ 0.10 $ 0.10
Sales        
Revenues:        
Total revenues $ 224,759 $ 159,043 $ 431,748 $ 380,381
Other revenues        
Revenues:        
Total revenues $ 2,681 $ 4,658 $ 9,456 $ 10,040