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Summary of Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information | The following table sets forth a summary of the unaudited quarterly results of operations for the years ended December 31, 2020 and 2019 (in thousands, except per share data):
| Q1 |  | Q2 |  | Q3 |  | Q4
2020 |  |  |  |  |  |  |
Revenues | $ | 173,167 |  |  | $ | 154,249 |  |  | $ | 229,728 |  |  | $ | 228,317 |
Costs applicable to sales | 118,917 |  |  | 90,015 |  |  | 112,772 |  |  | 118,631 |
Amortization | 36,162 |  |  | 27,876 |  |  | 32,216 |  |  | 35,133 |
Gross Profit | 18,088 |  |  | 36,358 |  |  | 84,740 |  |  | 74,553 |
Exploration | 6,386 |  |  | 11,855 |  |  | 12,818 |  |  | 11,584 |
Other operating expenses (General and administrative, Pre-development, reclamation, and other, and Impairment of long-lived assets) | 15,475 |  |  | 27,291 |  |  | 22,788 |  |  | 23,822 |
Income (loss) from continuing operations | (11,900) |  |  | (1,209) |  |  | 26,856 |  |  | 11,880 |
Income (loss) from discontinued operations | — |  |  | — |  |  | — |  |  | — |
Net income (loss) | (11,900) |  |  | (1,209) |  |  | 26,856 |  |  | 11,880 |
Cash provided by (used in) operating activities | (7,991) |  |  | 9,947 |  |  | 79,464 |  |  | 67,289 |
Capital expenditures | 22,208 |  |  | 16,682 |  |  | 22,996 |  |  | 37,393 |
Basic income (loss) per share: |  |  |  |  |  |  |
Net income (loss) from continuing operations | $ | (0.05) |  |  | $ | (0.01) |  |  | $ | 0.11 |  |  | $ | 0.05 |
Net income (loss) from discontinued operations | 0.00 |  |  | 0.00 |  |  | 0.00 |  |  | 0.00 |
Basic | $ | (0.05) |  |  | $ | (0.01) |  |  | $ | 0.11 |  |  | $ | 0.05 |
Diluted income (loss) per share: |  |  |  |  |  |  |
Net income (loss) from continuing operations | $ | (0.05) |  |  | $ | (0.01) |  |  | $ | 0.11 |  |  | $ | 0.05 |
Net income (loss) from discontinued operations | 0.00 |  |  | 0.00 |  |  | 0.00 |  |  | 0.00 |
Diluted | $ | (0.05) |  |  | $ | (0.01) |  |  | $ | 0.11 |  |  | $ | 0.05 |
| Q1 |  | Q2 |  | Q3 |  | Q4
2019 |  |  |  |  |  |  |
Revenues | $ | 154,870 |  |  | $ | 162,123 |  |  | $ | 199,469 |  |  | $ | 195,040 |
Costs applicable to sales | $ | 131,650 |  |  | $ | 131,948 |  |  | $ | 140,952 |  |  | 146,631 |
Amortization | $ | 41,876 |  |  | $ | 43,204 |  |  | $ | 45,678 |  |  | 48,118 |
Gross Profit | $ | (18,656) |  |  | $ | (13,029) |  |  | $ | 12,839 |  |  | 291 |
Exploration | $ | 3,714 |  |  | $ | 5,719 |  |  | $ | 5,893 |  |  | 7,201 |
Other operating expenses (General and administrative, Pre-development, reclamation, and other, and Impairment of long-lived assets) | $ | 13,908 |  |  | $ | 12,084 |  |  | $ | 14,486 |  |  | 263,250 |
Income (loss) from continuing operations | $ | (24,894) |  |  | $ | (36,764) |  |  | $ | (14,277) |  |  | (270,961) |
Income (loss) from discontinued operations | $ | 5,693 |  |  | $ | — |  |  | $ | — |  |  | — |
Net income (loss) | $ | (19,201) |  |  | $ | (36,764) |  |  | $ | (14,277) |  |  | (270,961) |
Cash provided by (used in) operating activities | $ | (15,846) |  |  | $ | 26,435 |  |  | $ | 41,996 |  |  | 39,295 |
Capital expenditures | $ | 27,438 |  |  | $ | 20,749 |  |  | $ | 30,678 |  |  | 20,907 |
Basic income (loss) per share: |  |  |  |  |  |  |
Net income (loss) from continuing operations | $ | (0.12) |  |  | $ | (0.18) |  |  | $ | (0.06) |  |  | $ | (1.13) |
Net income (loss) from discontinued operations | 0.03 |  |  | 0.00 |  |  | 0.00 |  |  | 0.00 |
Basic | $ | (0.09) |  |  | $ | (0.18) |  |  | $ | (0.06) |  |  | $ | (1.13) |
Diluted income (loss) per share: |  |  |  |  |  |  |
Net income (loss) from continuing operations | $ | (0.12) |  |  | $ | (0.18) |  |  | $ | (0.06) |  |  | $ | (1.13) |
Net income (loss) from discontinued operations | 0.03 |  |  | 0.00 |  |  | 0.00 |  |  | 0.00 |
Diluted | $ | (0.09) |  |  | $ | (0.18) |  |  | $ | (0.06) |  |  | $ | (1.13) |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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