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Revenue:
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenue RevenueOur revenue contracts generally provide for performance obligations that are: fulfilled and transfer control to customers over time; represent a series of distinct services that are substantially the same; involve the same pattern of transfer to the customer; and provide a right to consideration from our customers in an amount that corresponds directly with the value to the customer for the performance completed to date. Therefore, we recognize revenue in the amount to which we have a right to invoice. 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, 2021 and 2020. Sales tax and other similar taxes are excluded from revenues.
Three Months Ended September 30, 2021 Electric Utilities  Gas Utilities Power Generation MiningInter-company RevenuesTotal
Customer types:(in thousands)
Retail$179,982 $115,908 $— $15,814 $(8,846)$302,858 
Transportation— 37,651 — — (110)37,541 
Wholesale3,856 — 26,058 — (23,725)6,189 
Market - off-system sales15,149 75 — — (1,638)13,586 
Transmission/Other13,913 9,863 — — (5,297)18,479 
Revenue from contracts with customers$212,900 $163,497 $26,058 $15,814 $(39,616)$378,653 
Other revenues203 1,186 462 574 (488)1,937 
Total revenues$213,103 $164,683 $26,520 $16,388 $(40,104)$380,590 
Timing of revenue recognition:
Services transferred at a point in time$— $— $— $15,814 $(8,846)$6,968 
Services transferred over time212,900 163,497 26,058 — (30,770)371,685 
Revenue from contracts with customers$212,900 $163,497 $26,058 $15,814 $(39,616)$378,653 

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 
Nine Months Ended September 30, 2021 Electric Utilities  Gas Utilities Power Generation MiningInter-company RevenuesTotal
Customer types:(in thousands)
Retail$536,952 $601,358 $— $43,751 $(23,093)$1,158,968 
Transportation— 117,251 — — (329)116,922 
Wholesale12,788 — 79,662 — (71,656)20,794 
Market - off-system sales31,746 235 — — (6,197)25,784 
Transmission/Other41,339 29,378 — — (15,892)54,825 
Revenue from contracts with customers$622,825 $748,222 $79,662 $43,751 $(117,167)$1,377,293 
Other revenues2,619 5,030 1,369 1,738 (1,455)9,301 
Total revenues$625,444 $753,252 $81,031 $45,489 $(118,622)$1,386,594 
Timing of revenue recognition:
Services transferred at a point in time$— $— $— $43,751 $(23,093)$20,658 
Services transferred over time622,825 748,222 79,662 — (94,074)1,356,635 
Revenue from contracts with customers$622,825 $748,222 $79,662 $43,751 $(117,167)$1,377,293 

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 

Contract Balances
The nature of our primary revenue contracts provides an unconditional right to consideration upon service delivery; therefore, no customer contract assets or liabilities exist. The unconditional right to consideration is represented by the balance in our Accounts Receivable further discussed in Note 13.