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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenues and other income    
Equity in earnings of Sisecam Wyoming $ 4,610 $ 5,450
Gain on asset sales and disposals 247 165
Total revenues and other income 60,538 76,414
Operating expenses    
Operating and maintenance expenses 6,776 5,733
Depreciation, depletion and amortization 3,989 4,654
General and administrative expenses 6,832 6,327
Asset impairments 20 0
Total operating expenses 17,617 16,714
Income from operations 42,921 59,700
Interest expense, net [1] (2,668) (3,487)
Net income 40,253 56,213 [2]
Less: income attributable to preferred unitholders 0 (2,150)
Net income attributable to common unitholders and the general partner 40,253 54,063
Net income attributable to common unitholders 39,448 52,982
Net income attributable to the general partner $ 805 $ 1,081
Net income per common unit (see Note 5)    
Basic (in dollars per share) $ 3.01 $ 4.13
Diluted (in dollars per share) $ 2.97 $ 3.83
Net income $ 40,253 $ 56,213 [2]
Comprehensive income from unconsolidated investment and other 2,260 845
Comprehensive income 42,513 57,058
Royalty and Other Mineral Rights [Member] | Mineral Rights Segment [Member]    
Revenues and other income    
Revenues 51,260 67,372
Transportation and Processing Services [Member] | Mineral Rights Segment [Member]    
Revenues and other income    
Revenues $ 4,421 $ 3,427
[1] Included in interest expense, net was $0.2 million and $0.1 million of interest income for the three months ended March 31, 2025 and 2024, respectively.
[2] Net income includes $2.15 million of income attributable to preferred unitholders that accumulated during the period, of which $2.11 million is allocated to the common unitholders and $0.04 million is allocated to the general partner.