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Summary of Accounting Policies Impact of Adoption of ASC 606 (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenue from Contract with Customer [Abstract] |
Schedule of Prospective Adoption of New Accounting Pronouncements [Table Text Block] | The following highlights the impact of the adoption of ASC 606 on our condensed consolidated income statement and condensed consolidated balance sheet for the three months ended March 31, 2018:
|  | Three months ended March 31, 2018
Income statement |  | As Reported |  | Without Adoption of ASC 606 |  | Effect of Change Higher (Lower)
(in thousands) |  |  |  |  |  |
Regulated Energy operating revenues |  | $ | 109,393 |  |  | $ | 110,357 |  |  | $ | (964 | )
Regulated Energy cost of sales |  | $ | 48,231 |  |  | $ | 48,803 |  |  | $ | (572 | )
Depreciation and amortization |  | $ | 9,704 |  |  | $ | 9,689 |  |  | $ | 15 |
Income before income taxes |  | $ | 36,810 |  |  | $ | 37,217 |  |  | $ | (407 | )
Income taxes |  | $ | 9,955 |  |  | $ | 10,077 |  |  | $ | (122 | )
Net income |  | $ | 26,855 |  |  | $ | 27,140 |  |  | $ | (285 | )
|  | As of March 31, 2018
Balance sheet |  | As Reported |  | Without Adoption of ASC 606 |  | Effect of Change Higher (Lower)
(in thousands) |  |  |  |  |  |
Assets |  |  |  |  |  |
Accrued revenues |  | $ | 18,907 |  |  | $ | 20,213 |  |  | $ | (1,306 | )
Other assets |  | $ | 4,316 |  |  | $ | 4,508 |  |  | $ | (192 | )
Capitalization |  |  |  |  |  |
Retained earnings |  | $ | 250,024 |  |  | $ | 251,522 |  |  | $ | (1,498 | )

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- Definition Tabular disclosure of the comparison between amounts disclosed under previous guidance and new guidance. + References No definition available. + Details
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