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CONDENSED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 266,876 $ 211,916
Short-term investments 8,505 8,504
Trade accounts receivable 65,158 83,298
Inventories, net 76,964 118,713
Prepaid expenses and other receivables 34,557 45,052
Total current assets 452,060 467,483
Mineral interests, net 96,721 100,855
Property, plant and equipment, net 628,986 637,108
Deferred income taxes 157,367 174,372
Other long-term assets 11,944 14,118
Total assets 1,347,078 1,393,936
Current liabilities:    
Accounts payable 48,032 59,110
Accrued expenses 46,643 86,108
Short term financing lease liabilities 24,849 14,385
Other current liabilities 11,146 10,715
Total current liabilities 130,670 170,318
Long-term debt 380,292 379,908
Asset retirement obligations 61,543 57,553
Long term financing lease liabilities 39,241 24,091
Other long-term liabilities 37,178 36,825
Total liabilities 648,924 668,695
Stockholders’ Equity:    
Common stock, $0.01 par value per share (Authorized -140,000,000 shares as of June 30, 2021 and December 31, 2020, 53,630,797 issued and 51,408,956 outstanding as of June 30, 2021 and 53,408,040 issued and 51,186,199 outstanding as of December 31, 2020) 536 534
Preferred stock, $0.01 par value per share (10,000,000 shares authorized, no shares issued and outstanding) 0 0
Treasury stock, at cost (2,221,841 shares as of June 30, 2021 and December 31, 2020) (50,576) (50,576)
Additional paid in capital 253,922 249,746
Retained earnings 494,272 525,537
Total stockholders’ equity 698,154 725,241
Total liabilities and stockholders’ equity $ 1,347,078 $ 1,393,936