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Summary of Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2013
Quarterly Financial Data [Abstract] |
Summary of quarterly results of operations | The following table sets forth a summary of the unaudited quarterly results of operations for the years ended December 31, 2013 and 2012 (in thousands, except per share data):
| Q1 |  | Q2 |  | Q3 |  | Q4
2013 |  |  |  |  |  |  |  |  |  |  |
Sales of metals | $ | 171,797 |  |  | $ | 204,525 |  |  | $ | 200,825 |  |  | $ | 168,847 |
Net income (loss) | 12,270 |  |  | (35,040 | ) |  | (46,265 | ) |  | (581,528 | )
Amortization | 50,436 |  |  | 57,653 |  |  | 60,874 |  |  | 63,916 |
Production costs | 88,784 |  |  | 142,924 |  |  | 131,728 |  |  | 100,227 |
Exploration expenses | 6,841 |  |  | 6,774 |  |  | 3,305 |  |  | 5,440 |
Other operating expenses (general and administrative, pre-development, and write-downs) | 14,831 |  |  | 48,131 |  |  | 20,195 |  |  | 789,094 |
Cash provided by operating activities | 12,934 |  |  | 63,338 |  |  | 26,804 |  |  | 10,391 |
Capital expenditures | 12,827 |  |  | 27,201 |  |  | 32,726 |  |  | 28,059 |
Basic net income (loss) per share | $ | 0.14 |  |  | $ | (0.35 | ) |  | $ | (0.46 | ) |  | $ | (5.77 | )
Diluted net income (loss) per share | $ | 0.14 |  |  | $ | (0.35 | ) |  | $ | (0.46 | ) |  | $ | (5.77 | )
| Q1 |  | Q2 |  | Q3 |  | Q4
2012 |  |  |  |  |  |  |  |  |  |  |
Sales of metals | $ | 204,564 |  |  | $ | 254,406 |  |  | $ | 230,593 |  |  | $ | 205,929 |
Net income (loss) | 3,975 |  |  | 22,973 |  |  | (15,821 | ) |  | 37,550 |
Amortization | 52,592 |  |  | 61,024 |  |  | 52,844 |  |  | 52,397 |
Production costs | 92,542 |  |  | 131,182 |  |  | 124,365 |  |  | 106,473 |
Exploration expenses | 6,567 |  |  | 6,305 |  |  | 6,957 |  |  | 6,441 |
Other operating expenses | 8,664 |  |  | 13,680 |  |  | 11,836 |  |  | 5,883 |
Cash provided by operating activities | 17,002 |  |  | 113,203 |  |  | 79,735 |  |  | 61,694 |
Capital expenditures | 31,647 |  |  | 32,238 |  |  | 29,972 |  |  | 21,784 |
Basic net income (loss) per share | $ | 0.04 |  |  | $ | 0.26 |  |  | $ | (0.18 | ) |  | $ | 0.42 |
Diluted net income (loss) per share | $ | 0.04 |  |  | $ | 0.26 |  |  | $ | (0.18 | ) |  | $ | 0.42 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 + Details
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