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Quarterly Selected Financial Data (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                        
Revenues $ 563,249 $ 688,544 $ 644,462 $ 677,005 $ 745,192 $ 742,180 $ 713,776 $ 735,971   $ 2,573,260 $ 2,937,119 $ 3,014,357
Gross profit (loss) (44,964) 47,275 (16,507) 14,256 32,264 (5,851) (6,350) (49,842)        
Asset impairment and mine closure costs 488,865 2,120,292 19,146 0 17,541 5,060 1,512 0 $ 2,600,000 2,628,303 24,113 220,879
Loss from operations (539,033) (2,236,772) (69,546) (19,712) (5,303) (35,300) (35,805) (73,123)   (2,865,063) (149,531) (663,141)
Net loss $ (632,368) $ (1,999,476) $ (168,103) $ (113,195) $ (240,135) $ (97,218) $ (96,860) $ (124,140)   (2,913,142) (558,353) (641,832)
Diluted loss per common share (in dollars per share) $ (29.70) $ (93.91) $ (7.93) $ (5.32) $ (11.31) $ (4.58) $ (4.57) $ (5.85)        
Increase (decrease) in valuation allowance         $ 807,200 $ 15,800 $ 18,300 $ 23,800   $ 865,100 $ 226,900 $ 8,700