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Segment Information (Schedule of Operating Segment Results) (Details) - USD ($)
$ in Thousands
3 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, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                      
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
Adjusted EBITDA                 250,117 280,143 252,146
Depreciation, depletion and amortization                 379,345 418,748 426,442
Amortization of acquired sales contracts, net                 (8,811) (13,187) (9,457)
Total assets 5,106,738       8,429,723       5,106,738 8,429,723 8,990,193
Capital expenditures                 119,024 147,286 296,984
Operating Segments [Member] | PRB [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 1,448,440 1,490,377 1,482,812
Adjusted EBITDA                 258,300 198,074 206,910
Depreciation, depletion and amortization                 176,257 168,522 171,324
Amortization of acquired sales contracts, net                 (4,158) (3,961) (3,656)
Total assets 1,648,916       1,772,230       1,648,916 1,772,230 1,841,835
Capital expenditures                 22,535 44,305 9,784
Operating Segments [Member] | APP [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 834,606 1,108,358 1,145,801
Adjusted EBITDA                 82,837 110,693 88,883
Depreciation, depletion and amortization                 156,273 205,732 202,952
Amortization of acquired sales contracts, net                 (4,653) (9,433) (10,364)
Total assets 843,583       3,379,834       843,583 3,379,834 3,971,764
Capital expenditures                 20,599 23,638 167,759
Operating Segments [Member] | Other Segments [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 290,214 338,384 385,744
Adjusted EBITDA                 17,044 56,612 94,948
Depreciation, depletion and amortization                 40,768 40,125 45,741
Amortization of acquired sales contracts, net                 0 207 4,563
Total assets 310,949       339,809       310,949 339,809 402,922
Capital expenditures                 11,135 12,993 23,122
Corporate, Other and Elimination                      
Segment Reporting Information [Line Items]                      
Adjusted EBITDA                 (108,064) (85,236) (138,595)
Depreciation, depletion and amortization                 6,047 4,369 6,425
Amortization of acquired sales contracts, net                 0 0 0
Total assets $ 2,303,290       $ 2,937,850       2,303,290 2,937,850 2,773,672
Capital expenditures                 $ 64,755 $ 66,350 $ 96,319