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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
segment
Dec. 31, 2011
Dec. 31, 2010
Segment Information                      
Reported segment                 1    
Segment information                      
Consolidated revenue $ 374,825 $ 425,681 $ 343,183 $ 372,903 $ 402,487 $ 406,950 $ 387,679 $ 356,545 $ 1,516,772 $ 1,553,661 $ 1,370,761
Adjusted EBITDA                 338,828 351,695 322,733
Interest expense, net                 (35,241) (33,274) (46,373)
Depreciation, depletion and accretion                 (107,764) (99,596) (115,719)
Tax agreement benefit (expense)             (42,700)   29,000 (19,854) (19,669)
Derivative financial instruments                 11,511 2,275  
Income tax expense                 (62,614) (11,449) (31,982)
Net income 28,163 85,260 33,678 26,618 43,819 24,611 94,594 26,773 173,720 189,797 117,197
Total Assets 2,351,323       2,319,319       2,351,323 2,319,319  
Capital Expenditures                 411,435 212,129 91,639
Total revenue from external customers by geographic location                      
United States                 1,211,884 1,257,604 1,194,800
Asia                 296,821 287,236 163,030
Other                 8,067 8,821 12,931
Total revenue from external customers                 1,516,772 1,553,661 1,370,761
Owned and Operated Mines
                     
Segment information                      
Consolidated revenue                 1,205,652 1,241,567 1,154,864
Adjusted EBITDA                 283,280 318,751 286,342
Total Assets 1,826,165       1,484,099       1,826,165 1,484,099  
Capital Expenditures                 395,681 202,247 87,208
Logistics and Related Activities
                     
Segment information                      
Consolidated revenue                 338,804 327,417 205,377
Adjusted EBITDA                 57,080 24,707 18,820
Total Assets 46,426       49,636       46,426 49,636  
Capital Expenditures                 7,389    
Corporate and Other
                     
Segment information                      
Consolidated revenue                 37,984 50,925 50,326
Adjusted EBITDA                 36 8,120 16,315
Total Assets 478,536       786,537       478,536 786,537  
Capital Expenditures                 8,365 9,882 4,431
Eliminations of intersegment sales
                     
Segment information                      
Consolidated revenue                 (65,668) (66,248) (39,806)
Adjusted EBITDA                 (1,568) 116 1,256
Total Assets 196       (953)       196 (953)  
Expired significant broker contract
                     
Segment information                      
Adjusted EBITDA                     $ 8,207