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Revenue:
 9 Months Ended
Sep. 30, 2022
Revenue from Contract with Customer [Abstract]  
Revenue 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, 2022 and 2021. Sales tax and other similar taxes are excluded from revenues.

Three Months Ended September 30, 2022 Electric Utilities  Gas UtilitiesInter-company RevenuesTotal
Customer types:(in thousands)
Retail$211,489 $157,203 $— $368,692 
Transportation— 41,006 (99)40,907 
Wholesale13,667 — — 13,667 
Market - off-system sales16,770 186 — 16,956 
Transmission/Other15,919 8,875 (4,148)20,646 
Revenue from contracts with customers$257,845 $207,270 $(4,247)$460,868 
Other revenues824 1,018 (98)1,744 
Total revenues$258,669 $208,288 $(4,345)$462,612 
Timing of revenue recognition:
Services transferred at a point in time$7,928 $— $— $7,928 
Services transferred over time249,917 207,270 (4,247)452,940 
Revenue from contracts with customers$257,845 $207,270 $(4,247)$460,868 

Three Months Ended September 30, 2021 Electric Utilities  Gas UtilitiesInter-company RevenuesTotal
Customer Types:(in thousands)
Retail$185,892 $115,908 $— $301,800 
Transportation— 37,651 (110)37,541 
Wholesale7,247 — — 7,247 
Market - off-system sales13,511 75 — 13,586 
Transmission/Other12,904 9,863 (4,288)18,479 
Revenue from contracts with customers$219,554 $163,497 $(4,398)$378,653 
Other revenues850 1,186 (99)1,937 
Total Revenues$220,404 $164,683 $(4,497)$380,590 
Timing of Revenue Recognition:
Services transferred at a point in time$6,968 $— $— $6,968 
Services transferred over time212,586 163,497 (4,398)371,685 
Revenue from contracts with customers$219,554 $163,497 $(4,398)$378,653 
Nine Months Ended September 30, 2022 Electric Utilities  Gas UtilitiesInter-company RevenuesTotal
Customer types:(in thousands)
Retail$553,327 $947,290 $— $1,500,617 
Transportation— 125,196 (298)124,898 
Wholesale32,370 — — 32,370 
Market - off-system sales32,590 602 — 33,192 
Transmission/Other46,535 27,794 (12,445)61,884 
Revenue from contracts with customers$664,822 $1,100,882 $(12,743)$1,752,961 
Other revenues4,764 2,967 (315)7,416 
Total revenues$669,586 $1,103,849 $(13,058)$1,760,377 
Timing of revenue recognition:
Services transferred at a point in time$21,712 $— $— $21,712 
Services transferred over time643,110 1,100,882 (12,743)1,731,249 
Revenue from contracts with customers$664,822 $1,100,882 $(12,743)$1,752,961 

Nine Months Ended September 30, 2021 Electric Utilities  Gas UtilitiesInter-company RevenuesTotal
Customer Types:(in thousands)
Retail$554,143 $601,358 $— $1,155,501 
Transportation— 117,251 (329)116,922 
Wholesale24,261 — — 24,261 
Market - off-system sales25,549 235 — 25,784 
Transmission/Other38,315 29,378 (12,868)54,825 
Revenue from contracts with customers$642,268 $748,222 $(13,197)$1,377,293 
Other revenues4,556 5,030 (285)9,301 
Total Revenues$646,824 $753,252 $(13,482)$1,386,594 
Timing of Revenue Recognition:
Services transferred at a point in time$20,658 $— $— $20,658 
Services transferred over time621,610 748,222 (13,197)1,356,635 
Revenue from contracts with customers$642,268 $748,222 $(13,197)$1,377,293