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v3.20.2

Segment Information - Schedule of Segment Reporting Information by Segment (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of Reportable Segments |  |  |  | 2 |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  | $ 101,419 | $ 92,626 | $ 351,160 | $ 347,630 |
Operating Income |  |  |  |  |  |
Total operating income |  | 17,406 | 14,357 | 77,518 | 76,645 |
Other expense, net |  | (40) | (351) | 2,997 | (731) |
Interest |  | 4,584 | 5,403 | 15,452 | 16,583 |
Income Before Income Taxes |  | 12,782 | 8,603 | 65,063 | 59,331 |
Income Taxes on Continuing Operations |  | 3,502 | 2,352 | 16,082 | 15,354 |
Net Income |  | 9,261 | 5,621 | 49,146 | 42,589 |
Identifiable Assets |  |  |  |  |  |
Total identifiable assets |  | 1,888,088 |  | 1,888,088 |  | $ 1,783,198
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax |  | (19) | (630) | 165 | (1,388) |
Regulated Energy [Member] |  |  |  |  |  |
Operating Income |  |  |  |  |  |
Total operating income |  | 20,482 | 17,540 | 66,376 | 65,310 |
Identifiable Assets |  |  |  |  |  |
Total identifiable assets |  | 1,530,689 |  | 1,530,689 |  | 1,434,066
Unregulated Energy [Member] |  |  |  |  |  |
Operating Income |  |  |  |  |  |
Total operating income |  | (3,092) | (3,169) | 11,050 | 11,317 |
Identifiable Assets |  |  |  |  |  |
Total identifiable assets |  | 305,536 |  | 305,536 |  | 296,810
Other [Member] |  |  |  |  |  |
Identifiable Assets |  |  |  |  |  |
Total identifiable assets |  | 51,863 |  | 51,863 |  | 52,322
Other and eliminations [Member] |  |  |  |  |  |
Operating Income |  |  |  |  |  |
Total operating income |  | 16 | (14) | 92 | 18 |
Continuing Operations [Member] |  |  |  |  |  |
Identifiable Assets |  |  |  |  |  |
Total identifiable assets |  | 1,888,088 |  | 1,888,088 |  | $ 1,783,198
Operating Revenues, Unaffiliated Customers [Member] |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  | 101,419 | 92,626 | 351,160 | 347,630 |
Operating Revenues, Unaffiliated Customers [Member] | Regulated Energy [Member] |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  | 82,297 | 74,027 | 257,810 | 249,978 |
Operating Revenues, Unaffiliated Customers [Member] | Unregulated Energy [Member] |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  | 19,122 | 18,599 | 93,350 | 97,652 |
Intersegment Revenues [Member] |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 4,188 | 4,367 | 12,937 | 13,351 |
Intersegment Revenues [Member] | Regulated Energy [Member] |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 465 | 553 | 1,425 | 1,623 |
Intersegment Revenues [Member] | Unregulated Energy [Member] |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 3,592 | 3,681 | 11,116 | 11,333 |
Intersegment Revenues [Member] | Other [Member] |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 131 | 133 | 396 | 395 |
Retained Earnings [Member] |  |  |  |  |  |
Operating Income |  |  |  |  |  |
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent |  | 9,280 | 6,251 | 48,981 | 43,977 |
Net Income |  | $ 9,261 | $ 5,621 | $ 49,146 | $ 42,589 |
[1] | All significant intersegment revenues are billed at market rates and have been eliminated from consolidated operating revenues.

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