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Summary of Significant Accounting Policies Effects of New Accounting Pronouncements (Details) - 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
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulated Energy |  |  |  |  |  |  |  |  | $ 345,281 | $ 326,310 | $ 305,689
Accrued revenue | $ 27,499 |  |  |  | $ 22,279 |  |  |  | 27,499 | 22,279 |
Receivables and other deferred charges | 6,985 |  |  |  | 3,699 |  |  |  | 6,985 | 3,699 |
Retained earnings | 261,530 |  |  |  | 229,141 |  |  |  | 261,530 | 229,141 |
Regulated Energy cost of sales |  |  |  |  |  |  |  |  | 121,828 | 118,769 | 109,609
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 20,994 | 14,309 | 28,341
Depreciation and amortization |  |  |  |  |  |  |  |  | 40,802 | 36,599 | 32,159
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  |  |  |  |  |  |  |  | 77,574 | 72,433 | 73,016
Net Income | 17,801 | $ 5,538 | $ 6,387 | $ 26,855 | $ 26,101 | $ 6,833 | $ 6,046 | $ 19,144 | 56,580 | $ 58,124 | $ 44,675
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulated Energy |  |  |  |  |  |  |  |  | 346,289 |  |
Accrued revenue | 29,461 |  |  |  |  |  |  |  | 29,461 |  |
Receivables and other deferred charges | 6,816 |  |  |  |  |  |  |  | 6,816 |  |
Retained earnings | 263,323 |  |  |  |  |  |  |  | 263,323 |  |
Regulated Energy cost of sales |  |  |  |  |  |  |  |  | 122,463 |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 21,106 |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 40,767 |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  |  |  |  |  |  |  |  | 77,981 |  |
Net Income |  |  |  |  |  |  |  |  | 56,875 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accrued revenue | (1,962) |  |  |  |  |  |  |  | (1,962) |  |
Receivables and other deferred charges | 169 |  |  |  |  |  |  |  | 169 |  |
Retained earnings | $ (1,793) |  |  |  |  |  |  |  | (1,793) |  |
Deferred Revenue, Period Increase (Decrease) |  |  |  |  |  |  |  |  | (1,008) |  |
Regulated Energy cost of sales |  |  |  |  |  |  |  |  | (635) |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (112) |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 35 |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  |  |  |  |  |  |  |  | (407) |  |
Net Income |  |  |  |  |  |  |  |  | $ (295) |  |

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