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Significant Segment Financial Data (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Operating Revenue - Non-Regulated |  |  |  |  |  |  |  |  | $ 4,700 |  |
Revenues | $ 125,600 | $ 88,200 | $ 84,500 | $ 145,800 | $ 115,400 | $ 84,000 | $ 80,800 | $ 126,000 | 444,100 | $ 406,200 | $ 383,400
Interest Income |  |  |  |  |  |  |  |  | 2,400 | 2,400 | 1,200
Interest Expense |  |  |  |  |  |  |  |  | 26,400 | 25,500 | 23,700
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 50,400 | 46,900 | 46,600
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 8,393 | 17,537 | 15,354
Segment Profit | 11,000 | $ 2,800 | $ 3,600 | $ 15,600 | 11,200 | $ 2,300 | $ 3,100 | $ 12,400 | 33,000 | 29,000 | 27,100
Segment Assets | 1,298,300 |  |  |  | 1,241,900 |  |  |  | 1,298,300 | 1,241,900 | 1,128,200
Capital Expenditures |  |  |  |  |  |  |  |  | 102,400 | 119,300 | 98,100
Billed and Unbilled Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 439,400 |  |
Gas Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 216,100 | 194,000 | 181,200
Interest Income |  |  |  |  |  |  |  |  | 800 | 700 | 200
Interest Expense |  |  |  |  |  |  |  |  | 14,200 | 13,700 | 13,300
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 24,900 | 22,400 | 21,900
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 7,100 | 10,700 | 9,200
Segment Profit |  |  |  |  |  |  |  |  | 18,800 | 16,400 | 14,500
Segment Assets | 764,100 |  |  |  | 714,300 |  |  |  | 764,100 | 714,300 | 645,200
Capital Expenditures |  |  |  |  |  |  |  |  | 70,800 | 72,100 | 57,000
Gas Segment | Billed and Unbilled Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 210,700 |  |
Gas Segment | Rate Adjustment Mechanism Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 5,400 |  |
Electric |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 223,300 | 206,200 | 196,100
Interest Income |  |  |  |  |  |  |  |  | 800 | 1,000 | 700
Interest Expense |  |  |  |  |  |  |  |  | 9,000 | 8,800 | 8,300
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 23,100 | 23,400 | 23,800
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 4,200 | 7,500 | 6,600
Segment Profit |  |  |  |  |  |  |  |  | 11,400 | 11,900 | 11,100
Segment Assets | 484,200 |  |  |  | 476,900 |  |  |  | 484,200 | 476,900 | 441,100
Capital Expenditures |  |  |  |  |  |  |  |  | 28,400 | 33,700 | 30,100
Electric | Billed and Unbilled Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 228,700 |  |
Electric | Rate Adjustment Mechanism Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (5,400) |  |
All Other Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Income |  |  |  |  |  |  |  |  | 600 | 600 | 200
Interest Expense |  |  |  |  |  |  |  |  | 3,200 | 3,000 | 2,100
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 2,300 | 1,000 | 800
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (3,400) | (1,400) | (1,200)
Segment Profit |  |  |  |  |  |  |  |  | 1,500 | (500) | 400
Segment Assets | 43,100 |  |  |  | 44,000 |  |  |  | 43,100 | 44,000 | 35,100
Capital Expenditures |  |  |  |  |  |  |  |  | 3,200 | 13,500 | 11,000
Unregulated Operation |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Operating Revenue - Non-Regulated |  |  |  |  |  |  |  |  | 4,700 |  |
Revenues |  |  |  |  |  |  |  |  | 4,700 | 6,000 | 6,100
Interest Income |  |  |  |  |  |  |  |  | 200 | 100 | 100
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 100 | 100 | 100
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 500 | 700 | 800
Segment Profit |  |  |  |  |  |  |  |  | 1,300 | 1,200 | 1,100
Segment Assets | $ 6,900 |  |  |  | $ 6,700 |  |  |  | $ 6,900 | $ 6,700 | $ 6,800

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