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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues and other income:      
Total revenues and other income $ 488,849 $ 399,752 $ 358,117
Operating expenses:      
Operating and maintenance expenses 155,959 83,433 33,211
Operating and maintenance expenses—affiliates, net 16,031 10,770 8,821
Depreciation, depletion and amortization 100,828 79,876 64,377
General and administrative 7,036 7,287 11,452
General and administrative—affiliates 5,312 3,258 3,286
Asset impairment 681,594 26,209 734
Total operating expenses 966,760 210,833 121,881
Income (loss) from operations (477,911) 188,919 236,236
Other income (expense)      
Interest expense (93,827) (80,185) (64,396)
Interest income 18 96 238
Other expense, net (93,809) (80,089) (64,158)
Net income (loss) (571,720) 108,830 172,078
Net income (loss) attributable to partners:      
Limited partners (559,492) 106,653 168,636
General partner $ (12,228) $ 2,177 $ 3,442
Basic and diluted net income (loss) per common unit (in dollars per share) $ (45.75) $ 9.42 $ 15.39
Weighted average number of common units outstanding (in shares) 12,230 11,326 10,958
Add: comprehensive income (loss) from unconsolidated investment and other $ (1,693) $ (81) $ 65
Comprehensive income (loss) (573,413) 108,749 172,143
Coal, Hard Mineral Royalty and Other      
Revenues and other income:      
Coal, hard mineral royalty and other—affiliates 89,715 84,559 93,026
Total revenues and other income 156,638 172,160 213,825
VantaCore      
Revenues and other income:      
Total revenues and other income 139,013 42,051 0
Oil and Gas      
Revenues and other income:      
Total revenues and other income 53,565 59,566 17,080
Soda Ash      
Revenues and other income:      
Total revenues and other income $ 49,918 $ 41,416 $ 34,186