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Summary of Accounting Policies Summary of Effect of Adoption on Consolidated Financial Statements (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Item Effected [Line Items] |  |  |
Accrued revenue | $ 18,907 |  | $ 22,279
Regulated Energy Operating Revenue | 109,393 | $ 97,654 |
Regulated Energy cost of sales | 48,231 | 40,244 |
Depreciation and amortization | 9,704 | 8,812 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | 36,810 | 31,660 |
Income taxes | 9,955 | 12,516 |
Net Income | 26,855 | $ 19,144 | 58,124
Other assets | 4,316 |  | 3,699
Retained earnings | 250,024 |  | $ 229,141
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |
Item Effected [Line Items] |  |  |
Accrued revenue | 20,213 |  |
Regulated Energy Operating Revenue | 110,357 |  |
Regulated Energy cost of sales | 48,803 |  |
Depreciation and amortization | 9,689 |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | 37,217 |  |
Income taxes | 10,077 |  |
Net Income | 27,140 |  |
Other assets | 4,508 |  |
Retained earnings | 251,522 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |
Item Effected [Line Items] |  |  |
Accrued revenue | (1,306) |  |
Deferred Revenue, Period Increase (Decrease) | (964) |  |
Regulated Energy cost of sales | (572) |  |
Depreciation and amortization | 15 |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | (407) |  |
Income taxes | (122) |  |
Net Income | (285) |  |
Other assets | (192) |  |
Retained earnings | $ (1,498) |  |

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- Definition Amount of increase (decrease) in deferred revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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