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SUPPLEMENTARY DATA - QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Mar. 31, 2011 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | $ 383,277 |  | $ 449,579 | $ 523,731 |  | $ 538,940 |  | $ 494,407 | $ 497,510 | $ 593,291 | $ 578,387 | $ 1,820,678 |  | $ 1,895,527 | $ 2,163,595 | $ 1,820,678
Gross Profit |  |  |  |  | 18,234 |  | 45,299 | 22,560 |  | 54,550 |  | 49,278 | 62,506 | 86,655 | 96,751 |  |  | 140,643 | 295,190 | 294,139
Net Income (Loss) Attributable to Parent |  |  |  |  | $ (53,046) | [1] | $ (9,067) | $ (20,511) | [2] | $ 2,163 | [3] | $ (15,580) | $ 8,093 | $ 23,217 | $ 19,475 |  |  | $ (80,461) | $ 35,205 | $ 107,231
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic | $ (1.58) | $ (0.47) | $ (0.40) | $ 0.02 | $ (1.58) | [1] | $ (0.47) | $ (0.40) | [2] | $ 0.02 | [3] | $ (0.29) | $ 0.15 | $ 0.43 | $ 0.38 |  |  | $ (2.43) | $ 0.66 | $ 2.47
Earnings Per Share, Diluted | $ (1.58) | $ (0.47) | $ (0.40) | $ 0.02 | $ (1.58) | [1] | $ (0.47) | $ (0.40) | [2] | $ 0.02 | [3] | $ (0.29) | $ 0.15 | $ 0.40 | $ 0.34 |  |  | $ (2.43) | $ 0.64 | $ 2.05
Mining asset impairment and inventory writedown |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34,797 | $ 39,932 | $ 0 | $ 0
Noncash goodwill impairment charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,571 | 0 | 0
Convertible debt conversion charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (7,273) | 0
Gain on earthquake insurance recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (22,451) | 0
Loss on senior note repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ (22,734) | $ 0
[1] | Loss on senior note repurchase of $22.7 million was included in the quarter ended December 31, 2013.
[2] | Gain on earthquake insurance recovery of $22.5 million was included in the quarter ended June 30, 2013.
[3] | (a) Mining asset impairment and inventory writedown of $34.8 million was included in the quarter ended June 30, 2014.

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