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Summary of Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Summary of quarterly results of operations |  |  |  |  |  |  |  |  |  |  |
Sales of metal | $ 168,847 | $ 200,825 | $ 204,525 | $ 171,797 | $ 205,929 | $ 230,593 | $ 254,406 | $ 204,564 | $ 745,994 | $ 895,492 | $ 1,021,200
NET INCOME (LOSS) | (581,528) | (46,265) | (35,040) | 12,270 | 37,550 | (15,821) | 22,973 | 3,975 | (650,563) | 48,677 | 93,499
Amortization | 63,916 | 60,874 | 57,653 | 50,436 | 52,397 | 52,844 | 61,024 | 52,592 | 232,879 | 218,857 | 224,500
Production costs | 100,227 | 131,728 | 142,924 | 88,784 | 106,473 | 124,365 | 131,182 | 92,542 | 463,663 | 454,562 | 419,547
Exploration | 5,440 | 3,305 | 6,774 | 6,841 | 6,441 | 6,957 | 6,305 | 6,567 | 22,360 | 26,270 | 19,128
Other operating expenses | 789,094 | 20,195 | 48,131 | 14,831 | 5,883 | 11,836 | 13,680 | 8,664 |  |  |
Cash provided by operating activities | 10,391 | 26,804 | 63,338 | 12,934 | 61,694 | 79,735 | 113,203 | 17,002 | 113,467 | 271,634 | 416,173
Capital expenditures | $ 28,059 | $ 32,726 | $ 27,201 | $ 12,827 | $ 21,784 | $ 29,972 | $ 32,238 | $ 31,647 | $ 100,813 | $ 115,641 | $ 119,988
Basic income per share: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (5.77) | $ (0.46) | $ (0.35) | $ 0.14 | $ 0.42 | $ (0.18) | $ 0.26 | $ 0.04 | $ (6.65) | $ 0.54 | $ 1.05
Diluted income per share: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (5.77) | $ (0.46) | $ (0.35) | $ 0.14 | $ 0.42 | $ (0.18) | $ 0.26 | $ 0.04 | $ (6.65) | $ 0.54 | $ 1.04

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