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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues and other income      
Equity in earnings of Sisecam Wyoming $ 18,135 $ 73,397 $ 59,795
Gain on asset sales and disposals 4,845 2,956 1,082
Total revenues and other income 268,007 370,009 388,962
Operating expenses      
Operating and maintenance expenses 28,036 32,315 34,903
Depreciation, depletion and amortization 15,535 18,489 22,519
General and administrative expenses 25,151 26,111 21,852
Asset impairments 87 556 4,457
Total operating expenses 68,809 77,471 83,731
Income from operations 199,198 292,538 305,231
Other expenses, net      
Interest expense, net [1] (15,554) (14,103) (26,274)
Loss on extinguishment of debt 0 0 (10,465)
Total other expenses, net (15,554) (14,103) (36,739)
Net income 183,644 [2] 278,435 [3] 268,492 [4]
Less: income attributable to preferred unitholders (4,248) (16,719) (30,000)
Less: redemption of preferred units (24,485) (60,929) 0
Net income attributable to common unitholders and the general partner 154,911 200,787 238,492
Net income attributable to common unitholders 151,813 196,771 233,722
Net income attributable to the general partner $ 3,098 $ 4,016 $ 4,770
Net income per common unit (see Note 6)      
Basic (in dollars per share) $ 11.69 $ 15.59 $ 18.72
Diluted (in dollars per share) $ 11.35 $ 13.08 $ 13.39
Net income $ 183,644 [2] $ 278,435 [3] $ 268,492 [4]
Comprehensive income (loss) from unconsolidated investment and other 1,452 (21,839) 15,506
Comprehensive income 185,096 256,596 283,998
Mineral Rights Segment [Member]      
Operating expenses      
Depreciation, depletion and amortization 14,800 17,300 20,900
Royalty and Other Mineral Rights [Member] | Mineral Rights Segment [Member]      
Revenues and other income      
Revenues 234,149 278,733 307,013
Transportation and Processing Services [Member] | Mineral Rights Segment [Member]      
Revenues and other income      
Revenues $ 10,878 $ 14,923 $ 21,072
[1] Included in interest expense, net was $0.7 million, $0.3 million and $0.3 million of interest income for the years ended December 31, 2024, 2023 and 2022, respectively.
[2] Net income includes $4.2 million of income attributable to preferred unitholders that accumulated during the period, of which $4.2 million is allocated to the common unitholders and $0.1 million is allocated to the general partner.
[3] Net income includes $16.7 million of income attributable to preferred unitholders that accumulated during the period, of which $16.4 million is allocated to the common unitholders and $0.3 million is allocated to the general partner.
[4] Net income includes $30.0 million of income attributable to preferred unitholders that accumulated during the period, of which $29.4 million is allocated to the common unitholders and $0.6 million is allocated to the general partner.