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Segment Information - Schedule of Segment Reporting Information, by Segment (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 $ 116,063 $ 125,479 $ 137,630 $ 109,677 $ 137,273 $ 91,609 $ 90,561 $ 80,309 $ 488,849 $ 399,752 $ 358,117
Depreciation, depletion and amortization 18,152 26,624 30,660 25,392 30,258 18,621 16,350 14,647 100,828 79,876 64,377
Asset impairment 50,953 626,838 3,803 0 20,585 0 5,624 0 681,594 26,209 734
Interest expense, net                 (93,809) (80,089) (64,158)
Net income (loss) (21,786) $ (600,001) $ 32,578 $ 17,489 8,645 $ 36,173 $ 31,407 $ 32,605 (571,720) 108,830 172,078
Capital expenditures                 44,924 536,318 368,104
Total assets 1,684,075       2,444,724       1,684,075 2,444,724 1,991,856
Corporate and Financing                      
Segment Reporting Information [Line Items]                      
Revenues                 0 0 0
Depreciation, depletion and amortization                 0 0 0
Asset impairment                 0 0 0
Interest expense, net                 (93,809) (80,089) (64,158)
Net income (loss)                 (106,157) (90,634) (78,896)
Capital expenditures                 0 0 0
Total assets 15,001       16,571       15,001 16,571 12,879
Intersegment Eliminations                      
Segment Reporting Information [Line Items]                      
Revenues                 0    
Coal, Hard Mineral Royalty and Other                      
Segment Reporting Information [Line Items]                      
Revenues                 156,638 172,160 213,825
Coal, Hard Mineral Royalty and Other | Operating Segments                      
Segment Reporting Information [Line Items]                      
Revenues                 246,353 256,719 306,851
Depreciation, depletion and amortization                 44,478 52,645 58,502
Asset impairment                 307,800 26,209 734
Interest expense, net                 0 0 0
Net income (loss)                 (138,388) 143,678 211,590
Capital expenditures                 428 5,351 0
Total assets 1,047,922       1,403,762       1,047,922 1,403,762 1,520,428
Coal, Hard Mineral Royalty and Other | Intersegment Eliminations                      
Segment Reporting Information [Line Items]                      
Revenues                 21    
Soda Ash                      
Segment Reporting Information [Line Items]                      
Revenues                 49,918 41,416 34,186
Soda Ash | Operating Segments                      
Segment Reporting Information [Line Items]                      
Revenues                 49,918 41,416 34,186
Depreciation, depletion and amortization                 0 0 0
Asset impairment                 0 0 0
Interest expense, net                 0 0 0
Net income (loss)                 49,918 41,416 34,186
Capital expenditures                 0 0 293,085
Total assets 261,942       264,020       261,942 264,020 269,338
Soda Ash | Intersegment Eliminations                      
Segment Reporting Information [Line Items]                      
Revenues                 0    
VantaCore                      
Segment Reporting Information [Line Items]                      
Revenues                 139,013 42,051 0
VantaCore | Operating Segments                      
Segment Reporting Information [Line Items]                      
Revenues                 139,013 42,051 0
Depreciation, depletion and amortization                 15,578 3,296 0
Asset impairment                 6,218 0 0
Interest expense, net                 0 0 0
Net income (loss)                 272 32 0
Capital expenditures                 14,039 171,116 0
Total assets 200,348       219,658       200,348 219,658 0
VantaCore | Intersegment Eliminations                      
Segment Reporting Information [Line Items]                      
Revenues                 (21)    
Oil and Gas                      
Segment Reporting Information [Line Items]                      
Revenues                 53,565 59,566 17,080
Oil and Gas | Operating Segments                      
Segment Reporting Information [Line Items]                      
Revenues                 53,565 59,566 17,080
Depreciation, depletion and amortization                 40,772 23,935 5,875
Asset impairment                 367,576 0 0
Interest expense, net                 0 0 0
Net income (loss)                 (377,365) 14,338 5,198
Capital expenditures                 30,457 359,851 75,019
Total assets $ 158,862       $ 540,713       158,862 $ 540,713 $ 189,211
Oil and Gas | Intersegment Eliminations                      
Segment Reporting Information [Line Items]                      
Revenues                 $ 0