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Revenue (Tables)
 9 Months Ended
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue The following tables depict the disaggregation of revenue, including intercompany revenue, from contracts with customers by customer type and timing of revenue recognition for each of the reportable segments for the three and nine months ended September 30, 2020 and 2019. Sales tax and other similar taxes are excluded from revenues.
Three Months Ended September 30, 2020 Electric Utilities  Gas Utilities Power Generation MiningInter-company RevenuesTotal
Customer types:(in thousands)
Retail$169,505 $94,367 $— $14,668 $(8,100)$270,440 
Transportation— 38,196 — — (139)38,057 
Wholesale5,925 — 26,049 — (24,521)7,453 
Market - off-system sales9,535 36 — — (1,904)7,667 
Transmission/Other15,653 10,277 — — (5,235)20,695 
Revenue from contracts with customers$200,618 $142,876 $26,049 $14,668 $(39,899)$344,312 
Other revenues224 1,053 469 568 (36)2,278 
Total revenues$200,842 $143,929 $26,518 $15,236 $(39,935)$346,590 
Timing of revenue recognition:
Services transferred at a point in time$— $— $— $14,668 $(8,100)$6,568 
Services transferred over time200,618 142,876 26,049 — (31,799)337,744 
Revenue from contracts with customers$200,618 $142,876 $26,049 $14,668 $(39,899)$344,312 
Three Months Ended September 30, 2019 Electric Utilities  Gas Utilities Power Generation MiningInter-company RevenuesTotal
Customer Types:
Retail$162,214 $89,810 $— $14,992 $(8,146)$258,870 
Transportation— 29,019 — — (195)28,824 
Wholesale8,210 — 16,119 — (14,414)9,915 
Market - off-system sales6,452 139 — — (1,488)5,103 
Transmission/Other14,274 10,965 — — (4,206)21,033 
Revenue from contracts with customers$191,150 $129,933 $16,119 $14,992 $(28,449)$323,745 
Other revenues234 811 9,692 560 (9,494)1,803 
Total Revenues$191,384 $130,744 $25,811 $15,552 $(37,943)$325,548 
Timing of Revenue Recognition:
Services transferred at a point in time$— $— $— $14,992 $(8,146)$6,846 
Services transferred over time191,150 129,933 16,119 — (20,303)316,899 
Revenue from contracts with customers$191,150 $129,933 $16,119 $14,992 $(28,449)$323,745 
Nine Months Ended September 30, 2020 Electric Utilities  Gas Utilities Power Generation MiningInter-company RevenuesTotal
Customer types:(in thousands)
Retail$459,949 $513,208 $— $43,917 $(23,855)$993,219 
Transportation— 113,096 — — (416)112,680 
Wholesale14,947 — 77,234 — (72,609)19,572 
Market - off-system sales17,940 197 — — (6,123)12,014 
Transmission/Other43,271 32,038 — — (14,080)61,229 
Revenue from contracts with customers$536,107 $658,539 $77,234 $43,917 $(117,083)$1,198,714 
Other revenues2,074 7,273 1,372 1,940 (819)11,840 
Total revenues$538,181 $665,812 $78,606 $45,857 $(117,902)$1,210,554 
Timing of revenue recognition:
Services transferred at a point in time$— $— $— $43,917 $(23,855)$20,062 
Services transferred over time536,107 658,539 77,234 — (93,228)1,178,652 
Revenue from contracts with customers$536,107 $658,539 $77,234 $43,917 $(117,083)$1,198,714 
Nine Months Ended September 30, 2019 Electric Utilities  Gas UtilitiesPower Generation MiningInter-company RevenuesTotal
Customer Types:
Retail$455,409 $567,715 $— $43,249 $(23,315)$1,043,058 
Transportation— 102,159 — — (903)101,256 
Wholesale23,334 — 46,650 — (40,923)29,061 
Market - off-system sales16,592 517 — — (5,047)12,062 
Transmission/Other42,865 35,767 — — (12,608)66,024 
Revenue from contracts with customers$538,200 $706,158 $46,650 $43,249 $(82,796)$1,251,461 
Other revenues2,465 1,135 29,114 1,777 (28,706)5,785 
Total Revenues$540,665 $707,293 $75,764 $45,026 $(111,502)$1,257,246 
Timing of Revenue Recognition:
Services transferred at a point in time$— $— $— $43,249 $(23,315)$19,934 
Services transferred over time538,200 706,158 46,650 — (59,481)1,231,527 
Revenue from contracts with customers$538,200 $706,158 $46,650 $43,249 $(82,796)$1,251,461