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Summary of Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019 and 2018 (in thousands, except per share data):
| 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 | )
| Q1 |  | Q2 |  | Q3 |  | Q4
2018 |  |  |  |  |  |  |  |  |  |  |
Revenues | $ | 163,267 |  |  | $ | 169,987 |  |  | $ | 148,795 |  |  | $ | 143,855 |
Costs applicable to sales | 99,340 |  |  | 108,246 |  |  | 116,857 |  |  | 116,507 |
Amortization | 30,777 |  |  | 29,459 |  |  | 31,184 |  |  | 37,053 |
Gross Profit | 33,150 |  |  | 32,282 |  |  | 754 |  |  | (9,705 | )
Exploration | 6,683 |  |  | 6,429 |  |  | 8,157 |  |  | 4,128 |
Other operating expenses (General and administrative, Pre-development, reclamation, and other, and Impairment of long-lived assets) | 13,029 |  |  | 11,270 |  |  | 15,850 |  |  | 11,239 |
Income (loss) from continuing operations | 691 |  |  | 2,930 |  |  | (53,044 | ) |  | 468 |
Income (loss) from discontinued operations | 550 |  |  | — |  |  | — |  |  | — |
Net income (loss) | 1,241 |  |  | 2,930 |  |  | (53,044 | ) |  | 468 |
Cash provided by (used in) operating activities | 15,541 |  |  | (1,294 | ) |  | 5,789 |  |  | 72 |
Capital expenditures | 42,345 |  |  | 41,165 |  |  | 39,472 |  |  | 17,805 |
Basic income (loss) per share: |  |  |  |  |  |  |
Net income (loss) from continuing operations | $ | — |  |  | $ | 0.02 |  |  | $ | (0.29 | ) |  | $ | — |
Net income (loss) from discontinued operations | — |  |  | — |  |  | — |  |  | — |
Basic | $ | — |  |  | $ | 0.02 |  |  | $ | (0.29 | ) |  | $ | — |
Diluted income (loss) per share: |  |  |  |  |  |  |
Net income (loss) from continuing operations | $ | — |  |  | $ | 0.02 |  |  | $ | (0.29 | ) |  | $ | — |
Net income (loss) from discontinued operations | — |  |  | — |  |  | — |  |  | — |
Diluted | $ | — |  |  | $ | 0.02 |  |  | $ | (0.29 | ) |  | $ | — |

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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=109225645&loc=d3e1280-108306 + Details
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