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Summary of Quarterly Financial Data (Unaudited) (Notes) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Unaudited Consolidated Quarterly Financial Information | SUMMARY OF QUARTERLY FINANCIAL DATA (UNAUDITED) The following table sets forth a summary of the unaudited quarterly results of operations for the years ended December 31, 2018 and 2017 (in thousands, except per share data):
| 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 Write-downs) | 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 | $ | 0.00 |  |  | $ | 0.02 |  |  | $ | (0.29 | ) |  | $ | 0.00 |
Net income (loss) from discontinued operations | 0.00 |  |  | 0.00 |  |  | 0.00 |  |  | 0.00 |
Basic | $ | 0.00 |  |  | $ | 0.02 |  |  | $ | (0.29 | ) |  | $ | 0.00 |
Diluted income (loss) per share: |  |  |  |  |  |  |
Net income (loss) from continuing operations | $ | 0.00 |  |  | $ | 0.02 |  |  | $ | (0.29 | ) |  | $ | 0.00 |
Net income (loss) from discontinued operations | 0.00 |  |  | 0.00 |  |  | 0.00 |  |  | 0.00 |
Diluted | $ | 0.00 |  |  | $ | 0.02 |  |  | $ | (0.29 | ) |  | $ | 0.00 |
| Q1 |  | Q2 |  | Q3 |  | Q4
2017 |  |  |  |  |  |  |  |  |  |  |
Revenues | $ | 185,554 |  |  | $ | 149,540 |  |  | $ | 159,919 |  |  | $ | 214,585 |
Costs applicable to sales | 114,490 |  |  | 102,229 |  |  | 101,559 |  |  | 121,982 |
Amortization | 38,693 |  |  | 30,733 |  |  | 32,401 |  |  | 44,722 |
Gross Profit | 32,371 |  |  | 16,578 |  |  | 25,959 |  |  | 47,881 |
Exploration | 5,252 |  |  | 7,813 |  |  | 9,792 |  |  | 7,454 |
Other operating expenses (General and administrative, Pre-development, reclamation, and other, and Write-downs) | 13,962 |  |  | 11,110 |  |  | 12,374 |  |  | 15,106 |
Income (loss) from continuing operations | 18,299 |  |  | (9,995 | ) |  | (11,728 | ) |  | 14,349 |
Income (loss) from discontinued operations | 364 |  |  | (960 | ) |  | (4,924 | ) |  | (6,724 | )
Net income (loss) | 18,663 |  |  | (10,955 | ) |  | (16,652 | ) |  | 7,625 |
Cash provided by (used in) operating activities | 43,938 |  |  | 24,103 |  |  | 37,308 |  |  | 91,811 |
Capital expenditures | 23,591 |  |  | 37,107 |  |  | 28,982 |  |  | 47,054 |
Basic income (loss) per share: |  |  |  |  |  |  |
Net income (loss) from continuing operations | $ | 0.10 |  |  | $ | (0.05 | ) |  | $ | (0.06 | ) |  | $ | 0.08 |
Net income (loss) from discontinued operations | — |  |  | (0.01 | ) |  | (0.03 | ) |  | (0.04 | )
Basic | $ | 0.10 |  |  | $ | (0.06 | ) |  | $ | (0.09 | ) |  | $ | 0.04 |
Diluted income (loss) per share: |  |  |  |  |  |  |
Net income (loss) from continuing operations | $ | 0.10 |  |  | $ | (0.05 | ) |  | $ | (0.06 | ) |  | $ | 0.08 |
Net income (loss) from discontinued operations | — |  |  | (0.01 | ) |  | (0.03 | ) |  | (0.04 | )
Diluted | $ | 0.10 |  |  | $ | (0.06 | ) |  | $ | (0.09 | ) |  | $ | 0.04 |

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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